Event Horizon Telescope Collaboration Wins 2020 Breakthrough Prize in Fundamental Physics

On Thursday, September 5th, 2019, the Event Horizon Telescope Collaboration was announced the winner of the prestigious Breakthrough Prize in Fundamental Physics. The $3 million prize, also known as the “Oscars of Science”, will be shared equally with 347 scientists co-authoring any of the six papers published by EHT. JCMT staff feel truly honored to have contributed to the Event Horizon Telescope Consortium that captured the first ever image of the Black Hole, Pōwehi, and look forward to our next EHT observing run in Spring of 2020. Deputy Director of JCMT, Jessica Dempsey, will be donating her portion of the award to the A Hua He Inoa program committed to propelling Hawaiian language and traditions to the global astronomical stage.

 

Event Horizon Telescope Collaboration: Winner of the 2020 Breakthrough Prize in Fundamental Physics

We’re pleased to announce that this year's Breakthrough Prize in Fundamental Physics goes to the Event Horizon Telescope Collaboration. The prize recognizes the team's extraordinary achievement in producing the first photograph of the “shadow" of a black hole. The experiment involved hundreds of collaborators across 8 telescopes, 60 institutions and 20 countries. Tune in to the Breakthrough Prize ceremony on the National Geographic channel November 3. More at https://breakthroughprize.org/News/54.

Posted by Breakthrough on Thursday, September 5, 2019

 

-20190909

Call for Proposals 20A: PI and Large Programs

JCMT Call for Semester 20A PI Programs

The East Asian Observatory is happy to invite PI observing proposals for semester 20A at the JCMT. Proposal submission is via the JCMT proposal handling system, Hedwig. For full details, and for proposal submission, please see

https://proposals.eaobservatory.org/

The 20A Call for PI Proposals closes on the 16th of September, 2019. The Hedwig system permits the submission (and repeated re-submission) of proposals until this deadline.

If this is your first time using Hedwig, you should ‘Log in’ and generate an account. There is a Hedwig ‘Help’ facility at the upper right corner of each page, and individual Help tags in many other places. Note that from this semester onward, Hedwig also allows a user to create copies of their preexisting proposals, in order to simplify the process of proposal re-submission.

JCMT Call for Large Programs (III)

The East Asian Observatory is also happy to invite applications for the third Call for JCMT Large Programs. At this time, 4,800 hours will be available for Large Programs up until the end of the 22B semester. Submissions will be accepted until the September 16th deadline. Please see here for more details. The proposal handling system, Hedwig, is available here.

For further details regarding current or previous Calls for Proposals, please see the proposal web pages.

Please contact us at helpdesk@eaobservatory.org if you have remaining questions about either of the above Calls for Proposals.

– 20190815

JCMT resumes night time operations

Dear JCMT Community,

We are pleased to announce that we have resumed night time operations at the JCMT. Our first night on sky way Sunday August 11th where we did a functional check out of our systems, took some engineering observations, followed by observations for the Large Program Queue. Our beloved Jim Hoge was the telescope operator in charge and was very happy to be back collecting precious scientific data. Currently we are limited to SCUBA-2 observing only whilst HARP undergoes engineering work. We hope to have it back on sky in September.

We would like to say a big thank you to our JCMT community for their support, patience and understanding. As always the safety of everyone on the mountain is of paramount importance to us.

 

Nāmakanui Has Arrived in Hilo!

Nāmakanui (pronounced “Naaah-mah-kah-noo-ee”), our newest addition to the JCMT instrumentation suite, arrived in Hilo last week and is now out of the box and being tested in Hilo by staff. The Hawaiian name “Nāmakanui” means “Big-Eyes” and it refers to a type of fish found in and around the islands.

When it is fully commissioned, Nāmakanui will be able to look at the sky using one of three receivers. Each receiver carries the name of a different type of Nāmakanui fish: `Ala`ihi (pronounced “ah-la-ee-hee”; 86 GHz), `U`u (pronounced “oo-oo”; 230 GHz), and `Āweoweo (pronounced “aaah-vay-oh-vay-oh”; 345 GHz). `U`u is the first receiver that will be commissioned.

This instrument will be critical for helping take the next Pōwehi image (the Hawaiian name for the Black Hole image at the centre of M87), hooking into the Event Horizon Telescope network. Additionally, it will be capable of delivering a wide range of fantastic science from studying the earliest stages of star formation and the late stages of stellar mass loss to investigating the gas dynamics of galaxies.  It takes 12 hours to cool down Nāmakanui to its operational temperature (4K) and so far the testing is going very well!

This instrument was built by a team at ASIAA (Taiwan) and is on loan the to the JCMT as a spare for the Greenland Telescope. We are very grateful for the opportunity to collect exciting data with this next-generation instrument!
To learn more about this instrument click here: https://buff.ly/2Zkv1lW

 

JCMT Operations Temporarily Suspended

Dear JCMT Community,

This week, the pending start of the construction of the Thirty Meter Telescope has sparked a protest which has blocked access to Maunakea for all traffic. Yesterday afternoon, the directors of the existing observatories made the joint decision to remove all personnel from their telescope facilities at the summit to guarantee the safety of their staff – the institutions’ top priority. Without guaranteed, reliable access to the telescopes, the Maunakea Observatories have suspended all summit activities (including remote operations) for the time being.

The safety of everyone on the mountain, MKO staff, law enforcement, and protestors is of paramount importance to us. We have voluntarily decided to remove our staff. This is not a decision we came to lightly, but want to emphasize the importance of safety for all staff and facilities.

We are truly grateful to the law enforcement offices who have been working around the clock to ensure the safety of everyone on Maunakea. The safety of our personnel – and of everyone on the mountain – remains our top priority.

We look forward to returning to normal operations as soon as the situation allows.

From the JCMT Team, Aloha and thank you for understanding.

Remote Operations

East Asian Observatory is excited to announce that JCMT will be moving to fully remote operation from November 1st, 2019. From that date forward, JCMT will not require visiting observers to staff observing runs at the telescope.

The close collaboration between our user community and the Observatory is one of the greatest strengths of the JCMT. EAO will continue to enhance this relationship in the new era of fully remote operations via visiting young student programs, online real-time access to nighttime observing, and a range of other initiatives. We welcome your ideas and need your contributions to continue to produce the high impact science that we are all so proud of at JCMT. EAO welcomes short- and long-term visits to the Observatory to meet and collaborate with staff and learn about data reduction and analysis techniques. Astronomers wanting to work with our upcoming new instrument suite or utilize complex observing modes (e.g. VLBI) will also be encouraged to visit the JCMT to assist with commissioning efforts to ensure high quality science is produced.

In addition to welcoming visiting astronomers, the EAO will continue to host the JCMT Users Meeting yearly (this year in Taiwan) and will continue to send observatory staff to our regions when requested for workshops.

Remote operation is not a new concept for the JCMT, having been done in the past on occasion, and routinely via Extended Observing shifts since 2013/2014 (for more see the January 2014 Newsletter). Progress towards fully remote observing has been moving at an excellent pace. The observatory’s engineering team has been working hard this summer to overhaul and upgrade JCMT systems – including an overhaul of the roof and door hydraulics – and this work is on schedule to be complete well in advance of our planned switchover in November.

The Observatory appreciates your support and understanding as we advance into to this exciting new era for JCMT science. If you have any questions or concerns, please email our helpdesk@eaobservatory.org.

Image Credit: William Montgomerie

As a reminder, to get up-to-date information about the JCMT please send an e-mail to jcmt_users+subscribe@eaobservatory.org.

Hawaiʻi Astronomer Wins Canadian Award

Hawai`i Astronomer Wins Canadian Award

Hawaiʻi attracts the world’s top talent in astronomy due to Maunakea being one of the leading sites to study the universe. Today, EAO/JCMT astronomer Dr. Alex Tetarenko was awarded the 2019 J. S. Plaskett Medal by the Canadian Astronomical Society (CASCA).

Dr. Tetarenko was awarded the medal for her doctoral thesis on the physics of relativistic jets in X-ray binaries, as revealed by radio, millimeter (mm), and sub-millimeter (sub-mm) observations. Dr. Tetarenko obtained her PhD at the University of Alberta, and is now a 2018 East Asian Observatory Fellow working in Hilo, Hawaiʻi.

Dr. Tetarenko was awarded the medal for her exceptional skills both as an observer and in her insightful physical interpretation of complex observational data. Specifically, she is a leading expert in mm/sub-mm observations of black hole X-ray binaries. Recently, the journal Nature published  Dr. Tetarenko’s paper on  the rapidly spinning black hole in the Galactic binary system V404 Cygni. Dr. Tetarenko and her team used the Very Long Baseline Array (part of which is located on Maunakea) to observe this stellar mass black hole eject rapidly rotating high-speed clouds of plasma (known as jets), which are thought to be driven by the effects of Einstein’s theory of general relativity.

Dr. Alex Tetarenko with the J.S. Plaskett Medal, Awarded by the Canadian Astronomical Society at the 2019 annual general meeting in Montreal, QC, Canada. Photo Credit: Steve Mairs

On being awarded the 2019 J. S. Plaskett Medal, Dr. Tetarenko said “I am honored and humbled by the award, and grateful to be included among the list of awesome Canadian astronomers who have come before me”. On living and working in Hawaiʻi, Dr. Tetarenko said “I absolutely love being based in Hawaiʻi. Not only is Hawaiʻi one of the foremost centres of astronomy in the world, where I have access to world class telescopes and all the support and resources I need for my research, but it is also a beautiful island with a rich culture, that provides a very welcome escape from harsh Canadian winters.

Media Contacts:

  • Alex Tetarenko
  • James Clerk Maxwell Telescope
  • 1-808-969-6519
  • a.tetarenko@eaobservatory.org

 

  • Jessica Dempsey
  • James Clerk Maxwell Telescope
  • 1-808-969-6512
  • j.dempsey@eaobservatory.org

Additional Links:

About East Asian Observatory/James Clerk Maxwell Telescope
The EAO (East Asian Observatory) is formed  by EACOA (East Asian Core Observatories Association) for the purpose of pursuing joint projects in astronomy within the East Asian region. The EAO is chartered as a non-profit Hawai`i corporation. Its first task is to assume the operation of the James Clerk Maxwell Submillimetre Telescope (JCMT) on the summit of Maunakea, Hawai`i. Pursuant to an agreement with the University of Hawai`i, the EAO also provides engineering and IT support to the UKIRT Observatory (UKIRT). The JCMT is run by the non-profit organization the East Asian Observatory.

 

Special Supplementary Call for South Korea-led Proposals – 19B

The East Asian Observatory invites JCMT observing proposals with Principal Investigators (PIs) affiliated with a South Korean institution only for a special 19B Supplementary Call for Proposals. Proposal submission is via the JCMT proposal handling system, Hedwig. For full details, and for proposal submission, please see here.

The proposal submission deadline for this Special 19B Supplementary Call for Proposals is July 8th, 2019.

This Call is using a new “Rapid Turnaround”-style peer-review format, in which all proposals submitted for this Call shall be peer-reviewed by the proposal creator (or designated co-author) of other proposals also submitted for this Call.

The proposal peer-review deadline for this Call is July 22nd, 2019.

If this is your first time using Hedwig, you should ‘Log in’ and generate an account. There is a Hedwig ‘Help’ facility at the upper right corner of each page, and individual Help tags in many other places.

Please contact us at helpdesk@eaobservatory.org if you have remaining questions.

– 20190215

EAO Futures meeting – a stepping stone to White Papers

The EAO Sub-mm Futures meeting held last week in Nanjing was a great success. All talks from the meeting are provided on the meeting program pages.

At the meeting the JCMT observatory had two major announcements:

1) The Observatory is seeking White Papers in support of a new 850 micron camera

The observatory seeks community input in the form of scientific White Papers in support of a new 850 micron camera for the JCMT. More information regarding the white papers will be provided at the EAO Futures Discussion wiki. Specifically White papers will be sought for:

The observatory is also soliciting for additional White Papers in addition to the above. All White Papers are to be submitted (visit the EAO wiki for a comprehensive list that have already been proposed). Deadline June 30th. A detailed description of the specification for the new 850 micron camera can be found here.

2) Announcing the JCMT Call for Large Programs (III)

The East Asian Observatory is pleased to provide an announcement of the third Call for JCMT Large Programs. At this time 4,800 hours will be available for Large Programs up until the end of the 2022B semester. This information is being provided ahead of the opening of the 20A Call in order for current and new teams to pursue discussion and planning. Submissions will be accepted from August 15th up until the September 15th deadline. This will likely coincide with the 20A PI Call. Fore more details click here. To reach the proposal handling system, Hedwig, and submit a proposal click here:

https://proposals.eaobservatory.org/

For further details visit our proposal web pages.

Spinning Black Hole Sprays Light-speed Plasma Clouds into Space

An international team of astronomers, including Dr Alex Tetarenko, a researcher working at the East Asian Observatory in Hilo, Hawai’i, have discovered rapidly swinging jets coming from a black hole within our own Galaxy the Milky Way, almost 8,000 light-years from Earth. This black hole is much closer to us than Pōwehi, a black hole recently imaged with the Event Horizon Telescope, located around 56 million light-years away from Earth in another Galaxy.

Published today in the journal Nature, the research shows jets from V404 Cygni’s black hole behaving in a way never seen before on such short timescales.

The rapidly spinning black hole in V404 Cygni was observed to eject high-speed clouds of plasma, known as jets, travelling at close to the speed of light. These jets appeared to also be rapidly rotating, with multiple clouds of material ejected just minutes apart.

Lead author Associate Professor James Miller-Jones, from the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR), said black holes are some of the most extreme objects in the Universe.

“This is one of the most extraordinary black hole systems I’ve ever come across,” Associate Professor Miller-Jones said. “Like many black holes, it’s feeding on a nearby star, pulling gas away from the star and forming a disk of material that encircles the black hole and spirals towards it under gravity”.

An artist’s impression of the binary system that includes the black hole V404 Cygni and a sun-like star that orbit one another. Credit: ICRAR.

“What’s different in V404 Cygni is that we think the disk of material and the black hole are misaligned. This appears to be causing the inner part of the disk to wobble like a spinning top and fire jets out in different directions as it changes orientation.”

V404 Cygni, located in the constellation of Cygnus, was first identified as a black hole in 1989 when it released a big outburst of jets and material.

Astronomers looking at archival photographic plates then found previous outbursts in observations from 1938 and 1956.

Associate Professor Miller-Jones said that when V404 Cygni experienced another very bright outburst in 2015, lasting for two weeks, telescopes around the world tuned in to study what was going on.

“Everybody jumped on the outburst with whatever telescopes they could throw at it. So we have this amazing observational coverage” he said.

When Associate Professor Miller-Jones and his team studied the black hole, they saw its jets behaving in a way never seen before.

Where jets are usually thought to shoot straight out from the poles of black holes, these jets were shooting out in different directions at different times.

And they were changing direction very quickly—over no more than a couple of hours.

An artist’s impression of the inner parts of the accretion disk around the black hole V404 Cygni. Credit: ICRAR.

Associate Professor Miller-Jones said the change in the movement of the jets was because of the accretion disk—the rotating disk of matter around a black hole.

He said V404 Cygni’s accretion disk is 10 million kilometres wide, 7 times the diameter of the Sun, and the inner few thousand kilometres was puffed up and wobbling during the bright outburst.

“The inner part of the accretion disk was precessing and effectively pulling the jets around with it. You can think of it like the wobble of a spinning top as it slows down—only in this case, the wobble is caused by Einstein’s theory of general relativity.” Associate Professor Miller-Jones said.

The research used observations from the Very Long Baseline Array, a continent-sized radio telescope made up of 10 dishes across the United States, from the Virgin Islands in the Caribbean to Maunakea, Hawai’i.

Co-author Alex Tetarenko—an East Asian Observatory Fellow working in Hilo Hawai`i, and a recent PhD graduate from the University of Alberta —said the speed the jets were changing direction meant the scientists had to use a very different approach to most radio observations.

Dr Alex Tetarenko outside of the James Clerk Maxwell Telescope Office in Hilo, Hawaiʻi. Credit: Alyssa Clark

“Typically, radio telescopes produce a single image from several hours of observation. But these jets were changing so fast that in a four-hour image we just saw a blur. It was like trying to take a picture of a waterfall with a one-second long exposure” Dr. Tetarenko said.

Observations taken by Dr. Tetarenko and her team with two more telescopes on Maunakea, Hawai`i, the James Clerk Maxwell Telescope (JCMT) and the Sub-millimeter Array (SMA), also hinted at a rapidly evolving jet. Previously published in the journal Monthly Notices of the Royal Astronomical Society, these observations tracking the brightness of the jet over time, revealed extreme flaring events that coincided with the directly imaged jet ejection events.

“The incredible changes in brightness we saw in this JCMT and SMA data, and the model we designed to explain these changes, provided key information needed to develop our imaging method for this paper” she said.

To directly image these rapidly changing jets, the researchers produced 103 individual images, each about 70 seconds long. Miller-Jones and Tetarenko then led the efforts to combine those images into a continuous video—a difficult task, as each image required its own careful analysis.

“The result has been well worth the effort, illustrating this unique and unusual black hole behaviour” Dr. Tetarenko said.

“We were gobsmacked by what we saw in this system—it was completely unexpected,” said study co-author Gregory Sivakoff, a University of Alberta astrophysicist.  “Finding this astronomical first has deepened our understanding of how matter behaves near black holes”.

Study co-author Dr Gemma Anderson, who is also based at ICRAR’s Curtin University node, said the wobble of the inner accretion disk could happen in other extreme events in the Universe too.

“Anytime you get a misalignment between the spin of black hole and the material falling in, you would expect to see this when a black hole starts feeding very rapidly,” Dr Anderson said.

“That could include a whole bunch of other bright, explosive events in the Universe, such as supermassive black holes feeding very quickly or tidal disruption events, when a black hole shreds a star.”

Narrated V404 Cygni Black Hole Animation from ICRAR on Vimeo.

An animation of the precessing jets and accretion flow in V404 Cygni narrated by Associate Professor James Miller-Jones of Curtin University and ICRAR. Zooming in from the high-speed plasma clouds observed with our radio telescope, we see the binary system itself. Mass from the star spirals in towards the black hole via an accretion disk, whose inner regions are puffed up by intense radiation. The spinning black hole pulls spacetime (the green gridlines) around with it, causing the inner disk to precess like a spinning top, redirecting the jets as it does so. Credit: ICRAR.

V404 Cygni Black Hole Jets Simulation from ICRAR on Vimeo.

High-speed plasma clouds ejected from V404 Cygni over a four-hour period on 22nd June, 2015. This movie is made directly from our high-resolution radio images taken with the National Science Foundationʻs Very Long Baseline Array. It shows clouds of plasma in the precessing jets moving away from the black hole in different directions. The scale of the images is approximately the size of our Solar System, and time is shown by the clock in the bottom right-hand corner. Credit: ICRAR and the University of Alberta.

Media Contacts:

  • James Clerk Maxwell Telescope
    • Alex Tetarenko
    • 1-808-969-6519
    • a.tetarenko at eaobservatory.org
  • James Clerk Maxwell Telescope
    • Jessica Dempsey
    • 1-808-969-6512
    • j.dempsey at eaobservatory.org

 

About East Asian Observatory/James Clerk Maxwell Telescope

The EAO (East Asian Observatory) is formed  by EACOA (East Asian Core Observatories Association) for the purpose of pursuing joint projects in astronomy within the East Asian region. The EAO is chartered as a non-profit Hawai`i corporation. Its first task is to assume the operation of the James Clerk Maxwell Submillimetre Telescope (JCMT) on the summit of Maunakea, Hawai`i. Pursuant to an agreement with the University of Hawai`i, the EAO also provides engineering and IT support to the UKIRT Observatory (UKIRT). The JCMT is run by the non-profit organization the East Asian Observatory.

JCMT Plays Critical Role in Producing World’s First Image of a Black Hole – Pōwehi

MAUNAKEA, HAWAIʻI –– Two of the world’s most powerful telescopes, located atop Maunakea, played a vital role in producing the world’s very first image of a black hole. Hawai‘i-based James Clerk Maxwell Telescope (JCMT) and Submillimeter Array (SMA) are part of the unprecedented Event Horizon Telescope (EHT) project. JCMT is operated by the East Asian Observatory; SMA is operated by the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics.

In April 2017, a groundbreaking observational campaign brought together eight telescopes at six locations around the globe to capture an image of Pōwehi, a supermassive black hole at the center of the Messier 87 galaxy.

Pōwehi

Using the Event Horizon Telescope, scientists obtained an image of the black hole at the center of galaxy M87, outlined by emission from hot gas swirling around it under the influence of strong gravity near its event horizon.

“Maunakea makes this discovery and the spectacular image of Pōwehi possible,” said Dr. Jessica Dempsey, deputy director of East Asian Observatory’s James Clerk Maxwell Telescope. “It’s perfect remote position, and the dry conditions on Maunakea’s summit, allow JCMT and SMA to collect the tiny amount of light that only touches our planet in a few very special places. Like the mountain itself, every drop of light we gather is precious.”

Astronomers collaborated with renowned Hawaiian language and cultural practitioner Dr. Larry Kimura for the Hawaiian naming of the black hole. Pōwehi, meaning embellished dark source of unending creation, is a name sourced from the Kumulipo, the primordial chant describing the creation of the Hawaiian universe. Pō, profound dark source of unending creation, is a concept emphasized and repeated in the Kumulipo, while wehi, or wehiwehi, honored with embellishments, is one of many descriptions of pō in the chant.

“It is awesome that we, as Hawaiians today, are able to connect to an identity from long ago, as chanted in the 2,102 lines of the Kumulipo, and bring forward this precious inheritance for our lives today,” said Dr. Kimura, associate professor at University of Hawai‘i at Hilo Ka Haka ‘Ula o Ke‘elikolani College of Hawaiian Language. “To have the privilege of giving a Hawaiian name to the very first scientific confirmation of a black hole is very meaningful to me and my Hawaiian lineage that comes from pō, and I hope we are able to continue naming future blackholes from Hawai‘i astronomy according to the Kumulipo.”

Dr Jessica Dempsey, Dr Larry Kimura, Dr Geoff Bower discuss the results at the JCMT, in front of the 15m dish.

The SMA and JCMT telescopes are key members of the Event Horizon Telescope project, which links together strategically placed radio telescopes across the globe to form a larger, Earth-sized telescope powerful enough to see a Lehua flower petal on the moon.

“SMA and JCMT, working together as one ‘ohana, pioneered the revolutionary technique to see such tiny and faint objects and they were critical in capturing the image of Pōwehi,” said Geoff Bower, chief scientist for Hawai‘i operations of Academia Sinica Institute of Astronomy and Astrophysics. “The spirit of aloha required to unite scientists and observatories across the world was born right here on Maunakea. And powerful new capabilities coming soon at SMA and JCMT mean that Hawai‘i’s groundbreaking contributions to understanding our universe are just beginning.”

The participation of the SMA and JCMT as the far-west anchor point of EHT’s telescope array allowed astronomers to effectively observe and “photograph” supermassive black holes, among the most mysterious and powerful objects in the cosmos.

About James Clerk Maxwell Telescope
Operated by the East Asian Observatory, the James Clerk Maxwell Telescope (JCMT) is the largest astronomical telescope in the world designed specifically to operate in the submillimeter wavelength region of the spectrum. The JCMT has a diameter of 15 meters and is used to study our Solar System, interstellar and circumstellar dust and gas, and distant galaxies. It is situated near the summit of Maunakea, Hawai‘i, at an altitude of 4,092 meters.

The JCMT is operated by the East Asian Observatory on behalf of The National Astronomical Observatory of Japan; Academia Sinica Institute of Astronomy and Astrophysics, Taiwan; the Korea Astronomy and Space Science Institute; Center for Astronomical Mega-Science, China. Additional funding support is provided by the Science and Technology Facilities Council of the United Kingdom and participating universities in the United Kingdom and Canada. The East Asian Observatory also proudly partners with Vietnam, Thailand, Malaysia, Indonesia, and India. Click here for more information.

About Event Horizon Telescope

The EHT collaboration involves more than 200 researchers from Africa, Asia, Europe, North and South America. The international collaboration is working to capture the first-ever image of a black hole by creating a virtual Earth-sized telescope. Supported by considerable international investment, the EHT links existing telescopes using novel systems — creating a fundamentally new instrument with the highest angular resolving power that has yet been achieved.

The individual telescopes involved are; ALMA, APEX, the IRAM 30-meter Telescope, the IRAM NOEMA Observatory, the James Clerk Maxwell Telescope (JCMT), the Large Millimeter Telescope Alfonso Serrano (LMT), the Submillimeter Array (SMA), the Submillimeter Telescope (SMT), the South Pole Telescope (SPT), the Kitt Peak Telescope, and the Greenland Telescope (GLT).

The EHT collaboration consists of 13 stakeholder institutes; the Academia Sinica Institute of Astronomy and Astrophysics, the University of Arizona, the University of Chicago, the East Asian Observatory, Goethe-Universitaet Frankfurt, Institut de Radioastronomie Millimétrique, Large Millimeter Telescope, Max Planck Institute for Radio Astronomy, MIT Haystack Observatory, National Astronomical Observatory of Japan, Perimeter Institute for Theoretical Physics, Radboud University and the Smithsonian Astrophysical Observatory.

This research was presented in a series of six papers published today in a special issue of The Astrophysical Journal Letters.

More information on the Event Horizon Telescope can be found on the EHT website. For a copy of the Press release in `ōlelo Hawai’i click here.

MEDIA CONTACT:

Dylan Beesley, Director, Bennet Group Strategic Communications

dylan at bennetgroup.com

Dr Jessica Dempsey, Deputy Director

j.dempsey at eaobservatory.org

 

Reactions to the news

Selection of Media

Regional Press Releases (in local language)

Additional resources including animations

NSF Media Materials

 

 

International Women’s Day 2019

The Women of Maunakea once again met to celebrate their achievements and seek more advancements at this years International Women’s Day event held on March 3rd at Imiloa Astronomy Centre, Hilo, Hawai`i.

At the event our organization introduced a new equality challenge for the entire astronomy community on Hawai‘i Island, pledging to support equality and diversity within their ranks. Jessica Dempsey, Deputy Director of EAO/JCMT stated that

“Living in one of the most diverse states in the country, host to the most female astronomers in the world, we are uniquely positioned to serve as a model of progress toward gender equity and diversity in the workplace”

Jessica seeks to get to gender parity within the ranks of the organization by 2024 .

The event has been followed with a number of social media posts by the Maunakea Observatories within Hawai`i in support of International Women’s Day 2019 held on March 8th (#IWD2019).

Big Island Now – Maunakea Observatories Launches Equity Challenge on International Women’s Day

Big Island Video News – International Women’s Day Mixer At Imiloa

Call for Proposals 19B

The East Asian Observatory is happy to invite PI observing proposals for semester 19B at the JCMT. Proposal submission is via the JCMT proposal handling system, Hedwig. For full details, and for proposal submission, please see

https://proposals.eaobservatory.org/

The 19B Call for Proposals closes on the 15th of March, 2019.

If this is your first time using Hedwig, you should ‘Log in’ and generate an account. There is a Hedwig ‘Help’ facility at the upper right corner of each page, and individual Help tags in many other places.

Please contact us at helpdesk@eaobservatory.org if you have remaining questions.

– 20190215

JCMT Transient Survey Team Observes Record-Breaking Flare

On November 26th, 2016, the JCMT Transient Survey Team observed what is estimated to be the most luminous known flare associated with a young stellar object. It is also the first coronal flare discovered at submillimetre wavelengths. The brief flash of light occurred in the direction of a binary system of forming stars known as “JW 566” in the Orion Nebula and it carried ten billion times the amount of energy of the solar flares observed around the Sun.

Left: The Orion Nebula as seen by SCUBA-2 at 850 microns. Right: Two images of
the field surrounded by the green square taken 6 days apart. Small rectangles/triangles show the
positions of known young stars found by other telescopes. On November 20th, 2016, there was
no signal. On November 26th, 2016, the flare was observed while it was already dimming from
its (unseen) maximum brightness.

The flare was discovered by JCMT support astronomer Dr. Steve Mairs using advanced image analysis techniques that had been developed by the Transient Survey team over the past 2 years. The SCUBA-2 observations lasted approximately 30 minutes over which time  the flare faded to half of the brightness measured at the beginning of the scan, indicating the event was short-lived. The flare is thought to be caused by an intense magnetic field re-connection event that energised charged particles to emit gyrosynchrotron/synchrotron radiation.

Press Release: Sky and Telescope, Hawai’i Tribune Herald, Big Island News

Publication: ArXiv, ApJ

The JCMT Transient Survey Team

The JCMT Transient Survey team is an international collaboration of 80 astronomers led by Dr. Gregory Herczeg of Peking (Kavli Institute for Astronomy and Astrophysics) and Dr. Doug Johnstone (National Research Council of Canada). The team has been monitoring 8 star-forming regions in the Milky Way with a monthly cadence since December, 2015. The survey will continue through January, 2020.

The Brightest Quasar in the Early Universe

Observations obtained by the JCMT helped uncover the Brightest Quasar in the Early Universe!

The light from Quasar J043947.08+163415.7 is gravitationally lensed by a dim Galaxy in the foreground, allowing Fan et al. (2019, APJL: 870, 11) to get a good look at this active galactic nucleus at a redshift of z = 6.51 (A distance of ~12.8 Billion Light years!). As the authors note, “This is the first such object detected at the epoch of reionization, and the brightest quasar yet known at z > 5”.

The JCMT is instrumental in observing distant star-forming galaxies. These galaxies have high concentrations of dust that reprocess the starlight such that it is emitted at infrared wavelengths. The light is then redshifted due to the expansion of the universe into the submillimetre regime. The star formation rate is estimated to be 10,000 times higher than that of our own Galaxy, the Milky Way.

Press Release:

Astronomers uncover the brightest quasar in the early universe

Publication:

The Discovery of a Gravitationally Lensed Quasar at z = 6.51


An artist’s rendering of a distance quasar (Credit: ESO/M. Kornmesserhttp://www.eso.org/public/images/eso1122a/)

A bit of history…

The name “Quasar” is a shortened version of the original designation scientists gave to a mysterious signal we didn’t have a scientific interpretation for: a “quasi-stellar radio source” discovered in 1963 by Maarten Schmidt.

Over decades of intensive studies, astronomers have been able to determine that these mysterious signals were coming from intense bursts of light in the hearts of galaxies far, far away.

Most (maybe all!) galaxies contain a supermassive black hole millions to billions times the mass of our Sun. In some of these galaxies, infalling material gets too close to the black hole and it heats up to millions of degrees, exploding outward in a massive release of energy!

We can detect those signals, which we now affectionately call Quasars, at submillimetre wavelengths with the JCMT.

Congratulations to Dr. Xiaohui Fan and his co-authors !

Discovering the Cosmic Nurseries of Giant Elliptical Galaxies

The birth of giant elliptical galaxies is a violent process, with most stars originating from incredible star-forming episodes and several galaxy mergers within large-scale structures (dubbed protoclusters). This formation process happened in the early epochs, when the Universe was only a few billion years old. Currently, researchers using the James Clerk Maxwell Telescope (JCMT) on Maunakea, Hawaiʻi are trying to locate the progenitors of elliptical galaxies, and thus protoclusters, using several observational techniques.

Astronomers have recently discovered a handful of rare, enormous nebulae that copiously emit in the Hydrogen Lyman-alpha transition, a tracer of intergalactic gas. These emissions cover vast distances, up to 30 times larger than the Milky Way. Most of these Enormous Lyman-Alpha Nebulae (ELANe) host multiple active galactic nuclei and are surrounded by several Lyman-alpha emission galaxies. These ELANe are prime candidates for progenitors of elliptical galaxies and massive protoclusters in the early stages of assembly. While these regions are promising, researchers are now tasked with determining the presence of protoclusters and of heavy star formation associated with each ELAN.

An international team of researchers started using the SCUBA-2 instrument on JCMT to characterize these protoclusters and the associated ELAN. Observing at 450 and 850 microns allows SCUBA-2 to capture the emission from dust powered by violent episodes of star formation, something that is not possible with optical telescopes.

Results from the targeted ELAN MAMMOTH-1 field (Fig. 1) revealed the presence of a violent starburst galaxy and emission from a veiled active galactic nuclei (Fig. 2). These sources likely power the extended Lyman-alpha emission, and could be the progenitor of an elliptical galaxy.

In addition, researchers find four times the number of dust-obscured sources in ELAN
MAMMOTH-1 compared to other standard regions. This likely confirms the presence of a rich structure surrounding ELAN MAMMOTH-1, and hints at the presence of a protocluster, hosting the progenitor of an elliptical galaxy. Figure 3 shows the distribution of Lyman-alpha emitting galaxies compared to the SCUBA-2 detections within the observed field. Hopefully, follow-up observations will confirm the relationship between these newly detected sources and a protocluster surrounding the ELAN. For now, these findings seem to agree with the expected theoretical characterizations of cosmic nurseries of giant elliptical galaxies.

Figure 1: ELAN MAMMOTH-1 at z=2.3. This figure shows the surface brightness map (in units of erg/s/cm2/arcsec2) of the Hydrogen Lyman-alpha emission of the ELAN MAMMOTH-1 using a custom-made narrow-band filter. The map is color-coded following the level of surface brightness (see colorbar on the left). The nebula is clearly extended on intergalactic scales (hundreds of projected kiloparsecs; see yellow scale). The red star indicates the position of the likely powering source of this extended emission (see Figure 2). This figure was adapted from Cai et al. (2017). Image Credit: Arrigoni Battaia F., Cai Z.

Figure 2: Spectral energy distribution for the source powering the ELAN MAMMOTH-1. The data-points are from Large Binocular Camera (Large Binocular Telescope) imaging and the Wide-field InfraRed Camera (United Kingdom Infrared Telescope) (Cai et al. 2017 and Xu et al. in prep.; blue), AllWISE source catalog (Wright et al. 2010; orange), the SCUBA-2 (JCMT) observations (magenta), and the FIRST survey (Becker et al. 1994; green). The SCUBA-2 data are key in constraining the spectral energy distribution of this source, allowing researchers to infer the presence of an obscured active galactic nucleus and of intense star formation of the order of 400 solar masses per year. Indeed, the grey line is the best fit model which includes a hot-dust emission component inherent of active galactic nuclei and a strong dust emission likely powered by intense star formation. This figure was adapted from Arrigoni Battaia et al. (2018) Image Credit: Arrigoni Battaia F./European Southern Observatory.

 

Figure 3: Location of known sources surrounding the ELAN MAMMOTH-1. The small black circles indicate the known galaxies emitting Lyman-alpha emission within the known galaxy large-scale structure surrounding the ELAN MAMMOTH-1. The brown crosses indicate the quasars within such large-scale structure. The large blue circles and yellow squares indicate the sources detected within the two bands of the SCUBA-2 instrument, 850 and 450 microns respectively. The orange diamonds indicate the only two sources with both Lyman-alpha emission and SCUBA-2 detection. One of them is the ELAN MAMMOTH-1. The number of detected sources at 850 microns in the SCUBA-2 data reveals four times more dust-obscured sources than in “standard” regions, likely confirming the presence of a rich protocluster surrounding the ELAN MAMMOTH-1. The brightest of the SCUBA-2 detections coincide with the peak of the known galaxy distribution (traced by the green contours) within this large-scale structure (numbers close to each blue circle indicate the flux at 850 microns). This figure was adapted from Arrigoni Battaia et al. (2018) Image Credit: Arrigoni Battaia F./European Southern Observatory.

Media Contacts:

European Southern Observatory/Max-Planck Institute for Astrophysics
Fabrizio Arrigoni Battaia
farrigon at eso.org

European Southern Observatory
Chian-Chou Chen
ccchen at eso.org

James Clerk Maxwell Telescope
Harriet Parsons
h.parsons at eaobservatory.org

About The Authors

The international authors of this paper are from European Southern Observatory, Germany, Durham University, UK, University of California, USA, Leiden University, Netherlands, Tsinghua University, China, and the Korea Astronomy and Space Science Institute, South Korea.

 

 

Observing Comet 46P/Wirtanen from the JCMT

Comet 46P/Wirtanen is known as a hyperactive comet. Hyperactive comets are a small family of comets whose activity levels are higher than expected. In addition to being hyperactive 46P/Wirtanen will make the 10th closest ever cometary approach to Earth of modern times (0.08au) this month.

JCMT with Comet 46P/Wirtanen. Credit: EAO/JCMT/Kevin Silva

JCMT astronomers will take this opportunity to map the distribution of chemicals like hydrogen cyanide and methanol in this comet’s coma, to try and determine if these chemicals emerged directly from the comet nucleus or were formed in the coma from other chemicals. This mapping will be performed by the JCMT spectral line instrument; HARP. In addition to observing these chemicals the astronomers are hoping the comet will be bright enough to  make other measurements that that will shed light on the original location and conditions of the comet’s formation within the very early stages of what we now know to be our Solar System.

JCMT comet hunters Iain Coulson, Yi-Jehng Kuan, Fang-Chun Liu along with Support Astronomer (Steve Mairs)

For more information on comet 46P/Wirtanen visit: http://wirtanen.astro.umd.edu/46P/

Comet 46P/Wirtanen from the NASA Astronomy Picture of the Day 2018 November 15, Image Credit & Copyright: Alex Cherney (Terrastro, TWAN).

ABC Film Crew Visit JCMT

This past week the JCMT was host to a film crew from the Australian Broadcasting Corporation, based in Sydney. The crew were visiting Hawaii as part of a science television program  called Catalyst. Specifically they were out visiting the JCMT as part of a program about the Black Hole at the centre of our Milky Way, and how JCMT, along telescopes from around the world are coming together to form the Event Horizon Telescope – looking to take an image of the shadow around the Black Hole at the centre of our Galaxy.

 

JCMT supports STEM Fest 2018 for Big Island Girl Scouts

The EAO Outreach Team was thrilled to be invited to help out at the 2018 STEM Fest event held in Waimea at the Kahilu Town Hall for Big Island Girl Scouts. The event, attended by 75 girls on November 17th, provided the opportunity to experience hands on activities from a variety of science and engineering fields.

JCMT staff members Alexis Achohido and Mimi Fuchs worked with Girl Scouts to discover how astronomers know what stars are made of. In particular we highlighted the work of  Cecilia Payne-Gaposchkin, who proposed a theory for the composition of stars in her 1925, her PhD Thesis!

As well as looking at what stars are made of we also looked at what dense interstellar dust clouds are made of and made our very own candy molecules.

Maunakea Wonders Teachers Workshop

The third Maunakea Wonders Teacher Workshop began on October 17th at the University of Hawai’i’s Department of Education in Hilo. Throughout the second half of October, we have the incredible opportunity to share fun astronomy activities and resources with the future teachers of Hawai’i. Despite the frigid weather, this included on-site tours of the JCMT and UKIRT where we had a blast talking about the different functions of each telescope on the mountain. We are looking forward to more fun and excitement on campus on October 31st – Mahalo nui loa to this vibrant group of educators!

-20181022

Maunakea Gender Equity and Diversity Survey 2018 Report

In July 2018, the Maunakea Gender Equity and Diversity Committee distributed a survey to the staff at the Maunakea astronomical organizations. The survey was intended to invite opinion on the current state of equity and diversity in the Maunakea astronomy community and seed conversation and ideas for enhancing diversity and inclusion in our organizations across our islands.

The report on the results of the survey is here:

Maunakea Gender Equity and Diversity Survey 2018 Report

and the Appendix A, listing the survey questions, is provided for reference:

Gender Equity and Diversity Survey questions

The first results are presented by Jessica Dempsey at the Maunakea Users’ Meeting on October 4th, 2018. A PDF of the talk is linked here for convenience. For usage or distribution of these data, please contact Jessica Dempsey: j.dempsey “at” eaobservatory.org.

Photo by Oro Whitley

– 20181004

 

Discovering Magnetized Inflow Accreting to the center of Milky Way Galaxy – An important force to transport gas to the supermassive black hole Sagittarius A*

Is magnetic field an important guiding force for gas accreting to supermassive black hole (SMBH) — for example, the one that our Milky Way Galaxy hosts? The role of magnetic field in this subject is little understood and trying to observe it has been challenging to astronomers. Researchers at the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), Taiwan, led by Dr. Pei-Ying Hsieh, have utilized a measurement of high resolution data by using the instruments on the James Clerk Maxwell Telescope (JCMT). Their result provides clear evidences in showing that the orientation of the magnetic field is in alignment with the molecular torus and ionized streamers rotating with respect to Sagittarius A* – the black hole our home galaxy hosts. The findings are published in Astrophysical Journal in 2018 August 2nd (2018, ApJ, 862, 150).

Color-composite images of the SMA map tracing the molecular gas of the CND (blue) and the Very Large Array (VLA) 6 cm map tracing the mini-spiral (red). The magnetic field of the JCMT-SCUPOL data and the model are overlaid with the white segments in the upper right and low left panel, respectively. The location of SgrA* is labeled with the black cross. The CND is a molecular torus (ring) rotating with respect to the supermassive black hole SgrA* in our Galaxy. The mini-spiral is hypothesized to be originated from the inner edge of the CND. The alignment of the magnetic field line along with the CND and the mini-spiral tells us that they are linked with a coherent magnetic field. The team found the magnetic field is able to guide the ionized particles from the CND to the mini-spiral, which suggests a picture the footprint of inflow near SgrA*. In the lower right panel, the latest dust polarization data taken in 2017 measured with the new instruments POL-2 installed in JCMT is shown. The magnetic field is shown with the white segments. An improved spatial coverage and sensitivity clearly reveal the connection between the CND and the mini-spiral at even higher spatial sampling than the JCMT-SCUPOL data, which confirm the picture the team proposed.


SgrA* – the best laboratory to study black hole feeding in the sky

Sagittarius A* (SgrA*),  being the closest SMBH in our home in the universe, the Milky Way Galaxy, has been targeted by many scientists to understand the nature of gas accretion in the past decades. Observing the gas accretion onto SMBH is critical to help us to understand how it releases tremendous energy.

The circumnuclear disk (CND) is a molecular torus rotating with respect to SgrA*, within which are the ionized gas streamers called mini-spiral (also called SgrA West) filling the molecular cavity. The mini-spiral is hypothesized to be originated from the inner edge of the CND. The CND, being the closest “food reservoir” of SgrA*, is therefore critical on the understanding of the feeding of SgrA*. However, looking for the physical evidences to connect the CND and the mini-spiral puzzles astronomers since they were discovered a few decades ago.

Intensive measurements of dynamical movements orbiting SgrA* have been done in the past decades, but another important force – the magnetic field – is rarely probed. This is solely because the weak polarized signal generated by the magnetic field from dust emission is difficult to measure. However, the magnetic field is expected to be important for material orbiting within and around the CND as the magnetic stress acting on the rotating disk can exert a torque to extract angular momentum from rotating gas, and thus drive gas inflows. Besides, The magnetic tension force is also possible to draw the gas back from the gravitational pull. Taking advantage of excellent atmospheric conditions of Mauna Kea summit at 4000 m, and large aperture size of the JCMT (15 m in diameter), the submillimeter polarization experiments were successfully obtained toward the Galactic Center to understand the role of magnetic field.

Tracing Magnetized Accreting Inflow

The team utilized the dust polarization data obtained by the JCMT-SCUPOL instrument to image the orientation of the magnetic field. A detailed comparison with higher-resolution interferometric maps from the Submillimeter Array (SMA) reveals that the magnetic field aligns with the CND.  Moreover, the innermost observed magnetic field lines also appear to trace and align with the mini-spiral coherently. This is the first attempt to reveal the footprint of inflow linking the CND and the mini-spiral since they were discovered a few decades ago. The comparison of the model and data reinforces the key idea that the CND and the mini-spiral can be treated as a coherent inflow-system.

The team found that the magnetic field is dynamically significant towards the CND and the mini-spiral. This finding tells us that the magnetic field is able to guide the motion of the ionized particles originated in the CND, and produce the observed spiral pattern of the mini-spiral. Dr. Hsieh said, “We found the magnetic field is critical to explain the inflow structure and will also help to understand the inflow picture in other galaxies hosting black hole similar to SgrA*. “

Paper and research team:

These observation results were published as Hsieh et al. “A Magnetic Field Connecting the Galactic Center Circumnuclear Disk with Streamers and Mini-spiral -Implications from 850 micron Polarization Data” in the Astrophysical Journal (published in the Astrophysical in August 2nd).

This research was conducted by:

Hsieh, Pei-Ying (ASIAA); Koch, Patrick M. (ASIAA); Kim, Woong-Tae (SNU); Ho, Paul T. P. (ASIAA; EAO); Tang, Ya-Wen (ASIAA); Wang, Hsiang-Hsu (CUHK)

This research is supported by the Ministry of Science and Technology (MoST) of Taiwan through the grants MoST 105-2811-M-001-141, MoST 106-2811-M-001-136, MoST 104-2119-M-001-019-MY3, MOST 105-2112-M-001-025-MY3, Academia Sinica Career Development Award, and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST; No. 3348-20160021).

Related Links:

https://sites.google.com/asiaa.sinica.edu.tw/newsite/ASIAA_TAIWAN_News/20180817

https://www.asiaa.sinica.edu.tw/news/shownews.php?i=0e2af7b8c43775f78802f11ca0063488

-20180816

Call for Proposals 19A

The East Asian Observatory is happy to invite PI observing proposals for semester 19A at the JCMT. Proposal submission is via the JCMT proposal handling system, Hedwig. For full details, and for proposal submission please see

https://proposals.eaobservatory.org/

The 19A Call for Proposals closes on the 15th of September, 2018.

If this is your first time using Hedwig, you should ‘Log in’ and generate an account. There is a Hedwig ‘Help’ facility at the upper right corner of each page, and individual Help tags in many other places.

Please contact us at helpdesk@eaobservatory.org if you have remaining questions.

– 20180815

Mahalo to Mailani Neal!

The East Asian Observatory wishes to extend a big mahalo to our summer intern Mailani Neal for her excellent work tracking temperature changes across the JCMT’s dish!

We are grateful for all her hard work and we wish her all the best as she enters her final year at Rensselaer Polytechnic Institute in New York!

This gif shows an example of the telescope’s changing temperature over one night in June, 2018:

This analysis is important for understanding calibration observations and the effect of the weather on all the data we collect.

Mahalo, Mailani!

– 20180807

POL-2 data reduction fix for source blurring

POL-2 is the JCMT’s sub-millimeter polarimeter working at both 450 and 850 microns. POL-2 is a polarimeter not a detector, and so requires SCUBA-2 for use. It is used to trace the alignment of dust particles at sub-millimeter wavelengths and thus the magnetic field orientation and strength (with some additional physics added into the mix) of regions in our Universe!

Recently it has been found that sometime there is a loss of synchronisation between data values and pointing information in the data reduction process (CALCQU, run by pol2map as part of step 1). This loss of synchronisation is triggered by anomalous values in the array of HWP (Half Wave Plate) angles stored in the raw data. The result is blurring (or smoothing) of sources in some POL-2 maps (see figure below).

The fix is to download our rsync this build of the starlink software and re-reduce your data. If you look at your re-reduce data you may find that some of your maps improve, depending on whether any of your observations suffered from the blurring problem. The size of the improvement will depend on how many blurred observations you have.

For regions where multiple observations were used to produce the final maps the issue may have been less pronounced if obsweight=yes was used.

In addition, users wishing to reduce POL-2 450 micron data are asked to ensure the data have been reduced using the latest starlink 2018A software prior to this release there was a bug in the software which caused a 4 degree difference  in the angular zero point at 850 and 450, so all 450 vector maps produced so far will have a systematic error of 4 degrees in the vector angle, unless updated software (rsync starlink or 2018A starlink) was used.

The image shows two total intensity maps made from an observation of OMC1. Left: before the fix for blurring. Right: after the fix for blurring.

Also did you know you can combine various I maps into a cube to view as a movie? You can do this (assuming you ran pol2map with “mapdir=maps”) by running:

kappa

paste in=maps/\*Imap out=Icube shift=\[0,0,1\]

gaia Icube

Then in gaia, in the pop-up window that holds the cube visualisation controls, drag the “Index of plane” slider left or right to step through the planes in the cube!

You can do the same for the Q or U maps by replacing “I” with “Q” or “U” above (note, that’s an upper case “I” for the externally masked I maps – use a lower case “i” for the auto-masked I maps).

– 20180724

SMU work and data checks

In May our engineering staff undertook major maintenance work of the Secondary Mirror Unit on the JCMT. After this work it was noted that the Secondary mirror was sometimes vibrating, which lead to beam deformation. This was noticed due to sporadic increased FCF values – and could also be seen in the aspect ratio of our calibrators (see image below). Observers who collected data between UT dates May 24th 2018 and 08:10UT on June 30th 2018 should be aware of this issue. Astronomers who may have affected observations should check their data closely. This issue was noted to be intermittent. If you have questions about the data quality please contact your Support Scientist or the observatory directly.

On June 30th, we applied a temporary work-around to account for these SMU vibrations. To implement a more permanent solution, the observatory briefly removed the GoreTex membrane to work on the Secondary Mirror Unit. This work was performed between Tuesday July 24th, and Monday, July 30th.  The PI and Large Program time were unaffected.

Below is a plot showing the aspect ratios of calibrator CRL 2688 over time. The blue, shaded region represents the nominal values. Note that the high aspect ratios observed in between the temporary and permanent fix (boxed in red) were part of a low elevation, poor weather (wet grade 5), poor seeing engineering and commissioning project. Regular observing was unaffected.

 

 – 20180815

CHIMPS-2 members meet in Liverpool

Members of the CHIMPS-2 Large Program met for a two day meeting in Liverpool on June 28th and 29th. The meeting covered data collection, reduction and analysis with astronomers from all over the globe. For more information on the CHIMPS-2 project click here. We wish the team “clear skies” as they look to expand the JCMT CO heterodyne data towards the Galactic Centre this summer.

– 20180708

RxA3m Retires

     We are only as good as the instruments we have. With this sentiment in mind, we make way for the next generation of instruments as we retire one of our long-serving heterodyne receivers, RxA3. 

RxA3m in the receiver cabin at JCMT

     RxA3 (http://www.eaobservatory.org/jcmt/instrumentation/heterodyne/rxa/) has been a stable source of great science for the JCMT since it was built by the Herzberg Institute of Astrophysics and delivered in 1998. It has served our JCMT user community well and the data collected from RxA3 will be utilized still for years to come. 

The GLT receiver installed at the JCMT when it was being tested in August 2017.

      With the retirement of RxA3, JCMT prepares for it’s replacement to arrive in January 2019 and hopes to be on sky by April 2019 in time for the next Event Horizon Telescope observing run. The replacement will be a three-receiver cryostat identical to that installed on the Greenland Telescope (GLT), and is estimated to be able to complete observations in approximately 1/4 of the time required by RxA3.
                      -2018/07/05

First observations of the magnetic field inside the Pillars of Creation: Results from the BISTRO survey

The BISTRO (B-Fields in Star-Forming Region Observations) Survey has for the first time mapped the magnetic field in the dense gas of the ‘Pillars of Creation’, using instruments on the James Clerk Maxwell Telescope (JCMT). The Pillars of Creation, in the Messier 16 star-forming region, which is also known as the Eagle Nebula, were the subject of one of the most iconic images taken by the Hubble Space Telescope (HST). The Pillars are a set of columns of cold, dense gas protruding into a region of hot, ionized plasma. The Pillars have nurseries of new stars forming at their tips, and are a particularly dramatic example of a feature found in many regions of interstellar space in which high-mass stars are forming.

We present the first high-resolution observations of the Pillars in polarized light at submillimeter wave- lengths – submillimeter light being on the cusp between infrared and radio waves, where the cold, dense dust and gas which will form the next generation of stars emits most of its light. Light emitted from these dusty regions is polarized perpendicular to the direction of its local magnetic field, and so we can use our observations to directly probe the magnetic field morphology within the dense gas of the Pillars of Creation. Our observations were taken at a wavelength of 0.85 mm as part of the BISTRO Survey, using the POL-2 polarimeter on the SCUBA-2 submillimeter camera at the JCMT. They show that the magnetic field runs along the length of the pillars, at a significantly different angle to the field in the surrounding ionized plasma, and has an estimated strength of approximately 170 − 320 microGauss (1.7 − 3.2 × 10−8 Tesla), an intermediate magnetic field strength for a region of space which is forming stars.

An illustrative figure of the BISTRO magnetic field vectors observed in the Pillars of Creation, overlaid on a HST 502 nm, 657 nm and 673 nm composite – HST imaging from Hester et al. (1996, AJ 111, 2349).

Young hot stars, with masses more than eight times that of the Sun, produce large numbers of high-energy photons. These high-energy photons ionize a volume of the region within which they form, splitting hydrogen atoms into pairs of protons and elections. As the shock front between the material ionized by the young stars and the untouched neutral material advances, complex structures form in the dense gas at the interface. Particularly, pillars of dense, neutral gas like those in M16 are found protruding into the ionized region, apparently left behind by the advancing shock front. The formation and evolution of these pillars is not well-understood – debate continues as to whether these pillars form behind obstructions to the shock front, or whether they can form from turbulent instabilities in the shock front itself. The role of the magnetic field in the formation of the Pillars is particularly uncertain, since the strength of the magnetic field in the dense parts of the Pillars has not been measured until now.

BISTRO magnetic field vectors overlaid on a HST 502 nm, 657 nm and 673 nm composite image of Pillar II. The magnetic field runs roughly parallel to the Pillar’s axis. No polarization is detected at the Pillar’s tip – this depolarization is consistent with a horseshoe-shaped magnetic field morphology on scales smaller than the beam.

Our observations of the magnetic field running along the length of the Pillars are consistent with the Pillars being formed by compression of gas with an initially weak magnetic field: the magnetic field has not had the strength to resist being dragged into its current configuration by the motions of the gas. However, the magnetic field strength appears to have been increased by being compressed in the forming pillars. The magnetic field strength that we estimate is large enough to magnetically support the sides of Pillars against collapsing radially under pressure from the surrounding hot plasma, and to prevent the Pillars collapsing under their own gravity. It is important to note though that the Pillars are still being destroyed by the same shock interaction that created them: the magnetic field that we measure is not strong enough to prevent the Pillars being gradually eroded from their tips by the effects of the young stars in the region. Our results suggest that the evolution and lifetime of the Pillars may thus be strongly influenced by the strength and orientation of their magnetic field: the Pillars’ longevity results from magnetic support.

Our proposed evolutionary scenario: (a) an ionization front moving perpendicular to the am- bient magnetic field approaches an existing over-density in the molecular gas. (b) The ionization front is slowed by the over-density. The flux-frozen magnetic field ‘bows’ into the forming pillar. (c) The com- pressed magnetic field supports the pillar against further gas-pressure- and gravity-driven radial collapse, but cannot support against longitudinal erosion of the over-density by ionizing photons. Throughout, dark blue shading represents molecular gas and light blue shading represents ionized material. The ionization front is shown as a black line. Grey dashed lines indicate the local magnetic field direction. Red arrows represent photon flux, black arrows represent magnetic pressure, and green arrows represent thermal gas pressure.

The James Clerk Maxwell Telescope, located on Mauna Kea in Hawaii, is operated by the East Asian Observatory. The BISTRO Survey is a large team of scientists working to understand the role of mag- netic fields in the formation of stars, with members from across the partner regions of the East Asian Observatory: China, Japan, South Korea, Taiwan and Vietnam, and from participating universities in the United Kingdom and Canada.

This research has been accepted for publication by The Astrophysical Journal Letters. A pre-print is available at http://arxiv.org/abs/1805.11554.

Kate Pattle, Derek Ward-Thompson, Tetsuo Hasegawa, Pierre Bastien, Woojin Kwon, Shih-Ping Lai, Keping Qiu, Ray Furuya, David Berry and the JCMT BISTRO Survey Team

Inquiries about this research: Email: kpattle@gapp.nthu.edu.tw

The “Pillars of Creation” is one of the most well-known images in astronomy, and it is very exciting to be able to add to what is known about this part of the sky.  The pillars are beautiful structures – remarkable for their highly coherent structure within the dynamic and highly energetic environment of a region forming high-mass stars.  We have found that the magnetic field within the Pillars is well-ordered, running along the length of the pillars, and is strong enough to influence the future evolution of the pillars, helping to support them against collapse.  This is an intriguing result because it shows us that the magnetic field is important to the region now, but also that it was likely not very important during the period when the pillars were forming.  The field appears to have changed significantly from its original direction to run along the pillars as they were formed by a shock interaction caused by nearby young stars.  This could not have happened if the magnetic field were strong enough to resist being moved.  Our results suggest that the importance of the magnetic field to the Pillars of Creation has evolved over time along with the Pillars themselves.

The JCMT is the only telescope in the world which could have made these observations – the JCMT’s POL-2 polarimeter and SCUBA-2 camera are a unique combination of instruments, observing at the wavelengths at which cold dust in star-forming regions emits most of its light.  POL-2 provides information on the magnetic field on the scale of objects such as the Pillars of Creation which is not available anywhere else.

We have already had a proposal accepted by the Submillimeter Array (SMA) on Mauna Kea to observe the magnetic field in the tips of the pillars in more detail.  In our JCMT observations we see the magnetic field disappear at the tips of the pillars.  This “depolarization” could be caused by tangled magnetic field lines or a complete reversal of magnetic field direction in the pillars’ tips causing the field to cancel out in our observations.  By observing at higher resolution with the SMA we will be able to see what the magnetic field looks like on these small scales, and to better understand what role the magnetic field is playing in the shock interaction which is driving the pillars’ evolution.  We could also potentially look in more detail still at the magnetic field in clumps in the pillars’ tips using the Atacama Millimeter/submillimeter Array (ALMA) in Chile, or observe the pillars in polarized near-infrared light using the airborne SOFIA observatory.

-2018/06/05

2018 OT update

We are always striving to do better at the JCMT and that means we often update our software. One software update that uses should be aware of is a new version of the JCMT Observing Tool.

It is particularly important to note that the OT version used for all semester 18B MSB preparation must be 20180516 (or newer). This may be checked via the OT start-up splash screen and also via the “Help -> About” menu option.

– 20180525

SMU Removal

Check out our hardworking staff carefully removing the Secondary Mirror Unit (SMU). JCMT is currently closed (2.5 weeks in May 2018) as the SMU undergoes some important maintenance. The basics of the work being done:
1. Chopper performance and XYZ tables measurements
2. Remove the chopper and service the SMU tables (strip down, clean, lubricate, change belts)
3. Reassemble SMU tables, reattach chopper and service (balance, vibrators, flex pivots, LVDTs, stingers)
4. Finalize and implement new zero points, rollover points, and limits
**Many thanks to our TSS Kevin Silva for putting together this awesome timelapse compilation.**

-20180514

International Women’s Day 2018


March 8th, 2018 was International Women’s Day. The EAO celebrated by hosting a special event at the ‘Imiloa Astronomy Center that gathered together all of the women who contribute to the Maunakea organizations. We strongly believe that the future of Maunakea lies in the hands of the young people of these islands. The bright and talented young women of our community are enabled and empowered by seeing women in successful roles at all levels of scientific, political and business enterprise. This event provided one more step, in what we hope will be many, towards gender equity in the Maunakea organizations and beyond. We are thrilled with the amount of support we received following the event. See below for links to articles and news features.

VIDEO: Maunakea Observatories Mark International Women’s Day

 

Hawaii News Now video: Maunakea Observatories honor International Women’s Day by Celebrating its Female Astronomers

Hawaii Tribune Herald article: Women Astronomers Hope to Inspire Girls to Take Up Science

Big Island Now article: Women of Hawai‘i Astronomy Community Gather to ‘Press for Progress’

– 20180315

Call for Proposals 18B

The East Asian Observatory is happy to invite PI observing proposals for semester 18B at JCMT. Proposal submission is via the JCMT proposal handling system, Hedwig. For full details, and for proposal submission please see

https://proposals.eaobservatory.org/

The 18B Call for Proposals closes on the 15th of March, 2018.

If this is your first time using Hedwig, you should ‘Log in’ and generate an account. There is a Hedwig ‘Help’ facility at the upper right corner of each page, and individual Help tags in many other places.

Please contact us at helpdesk@eaobservatory.org if you have remaining questions.

– 20180214

Membrane back on!

January 10, 2018  The JCMT’s protective membrane is back in place after our month of commissioning without it. Now we can go back to observing in reasonable wind and during the daytime!

 

-20180111

Engineering shutdown – May 2018

From time to time the JCMT is closed due to major maintenance work. The next scheduled closure of the JCMT will occur from April 30th 2018 to mid May 2018. During this time the Gore-Tex membrane windblind will be removed to provide access to the Secondary Mirror Unit for maintenance work. As the telescope will be unavailable for science during this time the SCUBA-2 Gas Handling System will also be worked on. SCUBA-2 will be warm during this period and should back to operational temperature/available for science use by the end of May.

– 20171201

Membrane removal scheduled for December 2017

The staff at EAO would like to announce that we are planning an approximately month-long observing campaign without our iconic Gore-Tex membrane windblind.

The removal of the membrane is due to the high demand for sub-mm polarimetry. Currently the instrument POL-2 is commissioned and working beautifully at 0.85mm, with some fantastic science results. POL-2 science at 0.85 mm has been so successful that we are keen to see if operating without the membrane – which can limit the throughput and increase instrumental polarization – we can commission POL-2 at 0.45 mm.

Observing without the membrane is not our normal mode of operation and the telescope will have additional operational limitations during this time. The JCMT will not take daytime observations and the operational wind limits will be reduced.

We expect to remove the membrane early in December and thank the JCMT astronomical community for their support.

– 20171122

JCMT OMP Database Migration Complete

The migration of our OMP database system is now complete.

Principal Investigators/Co-Investigators on current JCMT programs (17B PI programs, Urgent queue programs, and the Large Programs) should again be able to retrieve recently-acquired data for their program from either the program’s OMP page or directly from the JCMT data archive at the CADC. As usual, the former method requires that the user’s OMP and CADC accounts are first linked (please see here for more details).

Any PIs/Co-Is that continue to encounter problems should consult their designated Friend of Project (FoP).

– 20171120

JCMT Data Retrieval During Database Migration Period

We are currently migrating our OMP database system, a process that is expected to take up to 4 weeks. During this period, any Principal Investigators/Co-Investigators on current JCMT programs (17B PI, Urgent queue projects, and the Large Programs) wishing to retrieve recently-acquired data for their projects should download it directly from the JCMT data archive at the CADC, rather than from the project’s OMP pages.

– 20171102

Update: This database migration process has now been completed (see above for further details).

– 20171120

18-month twinkle in a forming star suggests
 the existence of a very young planet

Discovery made possible by a leap in submillimetre radio astronomy technology,
 comparable to viewing videos instead of photos.

November 1, 2017 — An international team of researchers have found an infrequent variation in the brightness of a forming star. This 18-month recurring twinkle is not only an unexpected phenomenon for scientists, but its repeated behavior suggests the presence of a hidden planet.

This discovery is an early win for the James Clerk Maxwell Telescope (JCMT) Transient Survey, just one-and-a-half years into its three-year mandate to monitor eight galactic stellar nurseries for variations in the brightness of forming stars. This novel study is critical to understanding how stars and planets are assembled. The survey is led by Doug Johnstone, Research Officer at the National Research Council of Canada and Greg Herczeg, Professor at Peking University (China), and is supported by an international team of astronomers from Canada, China, Korea, Japan, Taiwan and the United Kingdom.

“This variation in the brightness or twinkle of the star EC53 suggests that something large is disrupting the gravitational pull of the forming star. The fact that it recurs every 18 months suggests that this influence is orbiting around the star – it’s quite likely a hidden, forming planet,” says Doug Johnstone. It is thought that a companion planet is orbiting the star, and its passing gravitational pull disrupts the rate of the gas falling onto the forming star, providing a variation in the observed brightness, or light curve, of the star.

 

Young stars are born in regions of the galaxy where molecular gas is abundant. When the star is young, gas and dust form a thick cloud that surrounds the star. Some of this material quickly flattens into a disk, in which planets will form. The cloud blocks the star itself from optical view, so astronomers study the star indirectly by using the cloud to learn details about the star growing inside. The star builds up its mass as gravity attracts gas to move from the disk onto the star, a process that also releases significant energy that heats up the surrounding gas cloud. Astronomers use telescopes sensitive to sub-millimetre wavelengths, like the JCMT, to measure the cloud brightness and reveal details about the growth of the star.

EC53’s light curve anomaly was discovered by Hyunju Yoo, graduate student at Chungnam National University and advisor Jeong-Eun Lee, Professor at Kyung Hee University (South Korea), through careful analysis of monthly observations of Serpens Main, a stellar nursery known to contain many forming stars. Although the brightness of EC53 has been observed to vary periodically at near-infrared wavelengths for some time, these sub-millimetre observations were essential in validating that the brightness variation was due to heating from gas accreting onto the forming star, rather than variations in the cloudiness of the environment.

“What caught my eye was a new round of data that showed a sudden brightness that hadn’t existed in previous observations,” says Lee. “I knew that something unique and interesting must be happening around this forming star. It turned out that it is indeed a very special object, providing a new window into how stars and planets form.”

A deeper understanding of the formation of stars and planets

For the remainder of the three-year sub-millimetre survey, the team will continue to monitor EC53 and will also be searching for additional young stars showing variations in growth to learn more about how stars and planets assemble. There are already a half-dozen additional candidate variables within the survey. By studying these stars, and using additional telescope facilities such as the powerful Atacama Large Millimeter/submillimeter Array (ALMA) in Chile, the study will provide new and unique insight into the timescale for the formation of stars and planets, including whether planets form during or after the assembly of the star.

“This discovery marks a turning point; in a sense, it’s like sub-millimetre astronomy is moving from taking pictures of our galaxy to taking videos,” says Greg Herczeg. “The last 25 years have been devoted to perfecting observing techniques and instruments to allow us to see early star formation. But with recent advances in technology, we can now observe regions changing over time, for a deeper understanding of how stars form. This discovery is just one example of how much more we can now learn.”

Monitoring the brightness of forming stars over time using sub-millimetre wavelengths is an unconventional approach to observing that has been made possible by recent advances in imaging technology, like SCUBA-2, and data reduction processing which enables precise calibration and measurement.

The JCMT resides at the summit of Maunakea in Hawaii and is the largest single-dish sub- millimetre telescope in the world. The JCMT is operated by the East Asian Observatory, a partnership between China, Taiwan, South Korea and Japan, with support from the astronomy communities in Canada and the United Kingdom. The university-led contributions from Canada are supplemented by the NRC’s support for the JCMT archive at the Canadian Astronomy Data Centre.

This discovery has been accepted for publication in Astrophysical Journal and is available online.

This story is distributed on behalf of: The National Research Council of Canada, Peking University and Kyung Hee University.

Contacts

Media Relations Team
National Research Council of Canada
1-855-282-1637 (in Canada)
1-613-991-1431 (elsewhere in North America)
001-613-991-1431 (International)
media@nrc-cnrc.gc.ca
Twitter: @nrc_cnrc

The Kavli Institute for Astronomy and Astrophysics (KIAA)
Peking University
Shuyan Liu
+86-10-6275-6630
shuyan@pku.edu.cn

Kyung Hee University
Min-Jae Jung
Communications team
+82-10-6626-6694
ddubi17@khu.ac.kr

James Clerk Maxwell Telescope
Steve Mairs
1-808-969-6572
s.mairs@eaobservatory.org

– 20171101

Call for Proposals 18A

The East Asian Observatory is happy to invite PI observing proposals for semester 18A at JCMT. Proposal submission is via the JCMT proposal handling system, Hedwig. For full details, and for proposal submission please see

https://proposals.eaobservatory.org/

The 18A Call for Proposals closes on the 15th of September, 2017.

If this is your first time using Hedwig, you should ‘Log in’ and generate an account. There is a Hedwig ‘Help’ facility at the upper right corner of each page, and individual Help tags in many other places.

Please contact us at helpdesk@eaobservatory.org if you have remaining questions.

– 20170815

Green Land Telescope Receiver testing progressing well at the JCMT

The Greenland Telescope (GLT) is a novel project; taking a 12-meter radio antenna – prototype for the Atacama Large Millimeter/Submillimeter Array (ALMA) project from Chile, and relocating this telescope to Greenland.

By repurposing this telescope astronomers can take advantage of the near-ideal conditions of the Arctic to study the Universe at specific radio frequencies. Whilst the telescope is being commissioned the initial receiver that will be used at the GLT is being tested at the JCMT in Hawaii. Last week the alignment of the instrument was performed this morning using the Sun as a source – and at the JCMT the first astronomical source for this instrument!

form more information visit: www.asiaa.sinica.edu.tw/project/vlbi.php and www.cfa.harvard.edu/greenland12m.

The GLT receiver installed inside the receiver cabin on the JCMT.

The inside of the GLT receiver

Delivery of the GLT receiver to JCMT

– 20170814

EAO Mid Term Review Committee meet in Hilo

The EAO Mid Term Review committee are meeting this week in Hilo to discuss the future of the JCMT. When the East Asian Observatory took over operation of the JCMT back in 2015 it was for an initial 5 years. Since that time we have had 5 semesters of great science. We have successfully completed three large programs (S2COSMOS, SCOPE, MALATANG). We have uncovered new star-forming events in the sub-mm. We have discovered stellar mass black holes. Our EAO regions have gained access to both Subaru and SMA. Recently we welcomed Vietnam as an observing partner in the JCMT. So much to celebrate!

– 20170727

EACOA Fellow, Tie Liu, welcomed to EAO Hilo

EACOA Fellow Dr Tie Liu is the first EACOA Fellow to come to work at the EAO office in Hilo, Hawaii from KASI.

Tie Liu’s main research interest is high-mass star formation and molecular clouds. Tie is the head of a large consortium undertaking the SCOPE, SCUBA-2 Continuum Observations of Pre-protostellar Evolution, program studying Planck cold clumps at JCMT. This program is now (as of July 2017) complete after 300 hours of SCUBA-2 time over the past year and a half.

Tie is now turning the focus of this study to follow-up observations with JCMT (e.g. POL-2) as well as many other telescopes (e.g., ALMA, SMA, NRO 45-m, KVN, FAST 500m …).

The Staff at EAO are pleased to welcome Tie Liu into the scientific division and hope many more astronomers decide to visit JCMT in the future as long term visitors, to engage directly with JCMT staff.

– 20170724

“Stray Black Holes” discovered in the Galactic Centre

A research team led by Japanese astronomers using data taken with the James Clerk Maxwell Telescope (JCMT), have conducted detailed radio spectral observations of molecular gas around the nucleus of our Milky Way Galaxy, Sgr A*.

As a result, the team has discovered two compact molecular clouds that have extremely broad velocity widths at distances of approximately 20 light years from Sgr A*. Despite the fact that these peculiar clouds have large kinetic energies, no energy source has been found there. Thus, the team interprets that each of the clouds is driven by the high-velocity plunge of an isolated (invisible) black hole without a companion star into a giant molecular cloud.  This implies that multiple “stray black holes” are floating around a supermassive black hole lurking at the Galactic center.

Illustration of stray black holes floating around a supermassive black hole at the Galactic center.

1. Important Points

  • The team studied two unusual molecular clouds. These two clouds were discovered in the vicinity of the Galactic nucleus of the Milky Way, Sgr A*.  Their motions and physical properties were studied and their motions were deemed to be abnormal.
  • The origin of each of unusual clouds cannot be explained by an interaction with a supernova. The clouds are also not explained by a bipolar outflow from a protostar. This implies that the origin is likely to be an obscure astrophysical phenomena.
  • As a result of the large kinetic energies observed combined with no a lack of an obvious energy source, the team theorizes that the driving sources may be black holes rapidly plunging into molecular clouds.

2. Research Background

The Galactic nucleus Sgr A* is located at a distance of approximately 26,000 light years from the Earth, and recognized as a supermassive black hole with 4 million solar masses. The origin of the supermassive black hole remains unresolved. In contrast, a stellar mass black hole, which has a mass ranging from about three to several tens of solar masses, is known to be formed by the gravitational collapse of a massive star heavier than 30 solar masses. It is theoretically predicted that several hundred million stellar mass black holes lurk in the Milky Way.

However, the number of black hole candidates currently detected in the Milky Way is only 60. In general, gas and dust drawn by the gravitational force of a black hole constitute an accretion disk around it. After the materials are sufficiently accreted and the accretion disk gets hotter and emits intense electromagnetic waves. Typically stellar mass black holes in the Milky Way have been found by detection of X-ray radiation from their accretion disks. In order for an accretion disk to be continuously shining, a fueling source, i.e. a companion star, must be in the close vicinity of a black hole. However, such black holes (those with close companions) are very rare. Most of back holes are likely to be isolated and inactive. Thus, countless “stray black holes” should be floating in the Milky Way.

3. Research Results

The research team conducted spectral line observations of the Galactic central region within 30 light years of the Galactic nucleus Sgr A* to investigate kinematics and physical properties of molecular gas surrounding the nucleus, using the JCMT. In the observations, the team discovered two unusual molecular clouds (HCN–0.009–0.044 and HCN–0.085–0.094) with diameters of about 3 light years and extremely broad velocity widths wider than 40 km/s (See Figure b below). Each of these unusual clouds appears to stem from a larger cloud. Their motions seem to be different from those of well-known molecular clouds around the nucleus (See Figure a, and c below).

These motions imply enormous kinematic energies (>1047 erg). Such enormous kinetic energy may be produced by an interaction with a supernova explosion or a bipolar outflow form a bright massive protostar. However, no evidence of a supernova or a bright protostar was found toward these peculiar clouds.   The origin is probably “something” other than well-known astrophysical phenomena; inactive stellar mass Black Holes.

The data used to make this discovery (a) Position-velocity diagram along the yellow vertical line in the panel (b). (b) Integral intensity map of the Galactic central region around Sgr A* (shown by a white star) in the hydrogen cyanide (HCN) 354.6 GHz spectral line. The light-blue cross marks indicate the locations of the discovered peculiar compact clouds (HCN–0.009–0.044 and HCN–0.085–0.094). (c) Position-velocity diagram along the yellow horizontal line in the panel (b). (d, e) The spectral lines detected toward the peculiar clouds.

The team proposes that the high kinematic energy results from: “a high-speed compact gravitational source plunging into a molecular cloud and the gas is dragged along by the gravity of the compact source to form a gas stream.”

According this “plunge scenario”, such unusual clouds can be formed in two cases as follows:

  • A massive compact object with a mass larger than about 10 time the mass of our Sun plunges with a high velocity of about 100 km/s into a molecular cloud.
  • A compact object with a mass similar to that of the Sun plunges with a ultra high velocity of about 1000 km/s into a molecular cloud.

In the case 1), the candidate for the plunging object is a massive star or black hole. In the case 2), the candidate is a hypervelocity star which moves so fast that it can escape from the gravity of the Galaxy. However, no hypervelocity star has been found in the Galactic center and the number is theoretically predicted to be much less than that of black holes. Therefore, the driving sources of the two discovered clouds are likely to be massive stars or black holes. In addition, no bright massive stars have been found toward these clouds. Thus, a “stray black hole” floating around the supermassive black hole is the most plausible candidate for each of the driving sources of the two clouds.

4. Research Significance

This work is very meaningful since the possibility that a number of “stray black holes” are floating around a supermassive black hole at the Galactic center was indicated by the observational study for the first time.

The team has already discovered the peculiar molecular cloud in the Galactic disk (Bullet) that may also be driven by a high-velocity plunge of a stray black hole (Yamada et al. 2017, https://www.nao.ac.jp/en/news/science/2017/20170202-aste.html).

These studies which are based on spectral line observations of molecular gas suggest a new method of potentially discovering inactive isolated black holes that are undetected by traditional method such as X-ray observations. The number of black hole candidates is expected to dramatically increase by applying research methods similar to this work.

Recently, by detection of gravitational waves, it has been confirmed that black holes merge and grow. The team has also discovered a candidate for an intermediate mass black hole with a mass of 100 thousand solar masses at a distance of about 200 light years from the Galactic nucleus

(Oka et al. 2017, https://www.nao.ac.jp/en/news/science/2016/20160115-nro.html).

This intermediate mass black hole and stray black holes discovered in this work possibly contribute to growth of the supermassive black hole in future.

Inquiries about the research

Professor Tomoharu Oka
Department of Physics
Keio University Science and Technology
TEL: +81-45-566-1833 FAX: +81-45-566-1833

E-mail: tomo@phys.keio.ac.jp

http://aysheaia.phys.keio.ac.jp/index.html

These observation results were published as Takekawa et al. “Discovery of Two Small High-velocity Compact Clouds in the Central 10 pc of Our Galaxy” in the Astrophysical Journal Letters in July 2017.

The team behind this work are Shunya Takekawa, a Ph.D. student at Keio University, Japan, and Tomoharu Oka, a professor at Keio University.

This study was supported by a Grant-in-Aid for Research Fellow from the Japan Society for the Promotion of Science (15J04405).

Hawaii Island Inquiries about the research

Dr Harriet Parsons
EAO/JCMT
660 North A’Ohoku Place
Hilo, Hawaii, 96720

E-mail: outreach@eaobservatory.org

 – 2017/07/18

EAO/JCMT at APRIM

Astronomers from the East Asian Observatory/JCMT are in Taipei, Taiwan this week for the Asia Pacific Meeting of the International Astronomical Union (APRIM). If you are there please pop by our booth and say hello!

Maunakea Wonders – Teacher workshop success

For two days at the end of June EAO/JCMT hosted its first “Maunakea Wonders Teacher Workshop” primarily aimed at newly qualified teachers here on the island of Hawai’i. One day was spent learning about the cultural, environmental and astronomical role Maunakea plays combined with a trip to visit the CFHT (Canada France Hawai’i Telescope), and the JCMT. The second day was spent in the classroom discovering what Hawaii more about astronomy on the big island and the resources available to the community, teachers and students in Hawaii.

The workshop was kindly supported by MKAOC/CFHT and the University of Hawai’i Hilo’s School of Education.

First day of the Maunakea Wonders Teacher workshop included a trip to the Canada France Hawaii Telescope and then to JCMT.

Discovering cosmic distances

Discovering Teaching opportunities in Hawaii – with Gemini’s Starlab.

– 20170703

AstroDay 2017

EAO/JCMT staff once again volunteered their time to spend the day connecting with the community at the annual Hilo AstroDay. This year we explored the concept of magnetism and polarization in space.

For more about AstroDay please see:

A summary of the cryogenic work on SCUBA-2 this past winter

SCUBA-2 has been back on the sky for the past month producing excellent data, following both planned engineering down time to work on the instrument cryogenics and unplanned – to fix a vacuum leak.

The end of 2016 was a busy time for the EAO ETIS (Engineering, Technical Information Systems) staff. From the middle of the 2016 we were aware of a change in performance of one of the (two) pulse tube coolers (PTC) that cools the SCUBA-2 inner radiation shields and internal mirrors to below 4K. We were able to continue to use SCUBA-2 without any impact on the quality of the data, while we planned the major task of taking the 3 tonne instrument off the antenna and replacing both of the instrument PTC cold heads with new remote motor models.

The dilution fridge mixture was removed and the warm-up started on October 5th. SCUBA-2 was back on the sky with new PTCs and was operational by November 18th, 1 week ahead of schedule. However, during the subsequent cooldown, the cryostat vacuum was found not to be as good as expected.

Later in December, when we temporarily warmed-up (to 4K) to replace a small pump in the dilution refrigerator (DR) gas handling system – a regular procedure, the poor vacuum became a serious issue. Additional problems with pumps in the GHS and too high a pressure in the DR still prevented cooling below 1K. This is well above the operating temperature of the TES detectors.

The only course was to warm the instrument to ambient temperature and to then carry out extensive leak checking of the cryostat. A leak was found that we could fix. However, on detailed inspection, we discovered that the O-ring between the feedthrough and the top plate of the DR insert was cracked and would fail soon if we did not replace it.

Two weeks of skill and persistence was required to replace this O-ring to enable SCUBA-2 to be yet-again pumped, leak checked and cooled prior to the end of January. With the vacuum leak fixed, the cause of the second issue with the GHS that prevented cooling below 1K became apparent. This issue was caused by a particle filter on the input of the pump. After removing the offending filter SCUBA-2 was operational by February 5th.

The loss of an additional 6 weeks of observing with SCUBA-2 impacted our users. However, by catching the failing O-ring before a total loss of vacuum, we avoided the potential for more serious consequences to the instrument and a bigger disruption of the observing schedule. An extended period of good stable weather in recent weeks has allowed some of the affected programs to makeup for the missed nights.

In addition to the cryogenic work, new improved thermal blocking filters have been installed between the instrument window and the band defining filters for the detector arrays. We are now investigating the change in optical power on the detector arrays, to see if this has modified the stray light environment within the 4K box and improved SCUBA-2’s performance.

Jamie Cookson works on the repair of SCUBA-2.

– 20170407

Blue skies for Venus observations

Over the past two weekends the JCMT has been open and observing during the day. These daytime observations are needed to observe the middle atmosphere (altitude 70-110 km) of Venus.

The aim is to better understand atmospheric physics and chemistry. The way to advance understanding of fundamental atmospheric physics and chemistry in general is to study the atmospheres of individual planets – specifically in this case Venus!

The JCMT is used for this study because sub-millimeter spectroscopy is uniquely powerful for investigations of this altitude range on Venus. JCMT’s location on Maunakea, its ability to safely point arbitrarily close to the sun, and its observation flexibility (capability to modify observing strategies in as little as 5 minutes, during the observations) make it uniquely well-suited to Venus research.

Here is a video of the sky above the EAO office in Hilo – can you spot Venus? If you want to see what the weather is like on Maunakea click here. For a link to the EAO Hilo office weather click here.

-2017/03/28

Electronics Engineer job opening

We are currently recruiting for an Electronic Engineer to join the EAO/JCMT  Engineering Group. This group ensures that the telescopes and associated instruments are at a high level of operational readiness at all times. They apply technical knowledge in support of the testing, modification, maintenance, repair, and upgrading of EAO mechanical, electronic and electrical systems.

CLOSING DATE: March 24, 2017

For more information visit the EAO Jobs homepage.

– 2017/02/24

JCMT 2017 Users Meeting – see you again next year!

The 2017 JCMT Users meeting was held in Nanjing, China. The two day meeting was held on Monday, 13th and Tuesday 14th of February. An additional 1 half-day data reduction workshop was held immediately after the meeting on Wednesday 15th of February. The meeting was well attended and all talks are now available online here. We hope you have a good productive 2017 and hope to see you at our JCMT 2018 Users meeting in South Korea next January.

– 2017/02/21

Call for proposals 17B and Large Programs (II)

The East Asian Observatory is happy to invite PI observing proposals for semester 17B at JCMT (for details see here). Semester 17B runs from 01 August 2017 to 31 January 2018.

In addition the East Asian Observatory is happy to accept proposals for Large Programs – running from 01 August 2017 to 31 January 2019. More details about the Large Programs (II) call can be found here.

You can reach the proposal handling system, Hedwig,  and find complete details of this Call at:

https://proposals.eaobservatory.org/

Any further questions should be directed to our help desk: helpdesk@eaobservatory.org

If this is your first visit to Hedwig, you should go to ‘Log in’ and generate an account. There is a ‘Help’ facility at the upper right corner, and individual Help tags at many other places.

The 17B Call and Large Program (II) call for Proposals closes on the 15th of March 2017.

– 2017/02/13

17B semester Call at the Subaru Telescope is now open

The East Asian Observatory is pleased to partner with the Subaru Telescope to enable astronomers  from an East Asian participant region to have access to Subaru time. The East Asian Observatory proposals are considered by the Subaru scientific panel alongside regular Subaru proposals, with a guaranteed award of time of a total of 3 nights of observing in the semester.

The 17B semester Call at the Subaru Telescope is now open, click here for more details.

– 2017/02/08

Support Astronomer job opening

The EAO/JCMT is currently seeking an astronomer to join its team of support scientists. Duties include: Assists visiting astronomers in obtaining high-quality observational data; provides technical, scientific, and logistical support to astronomers before, during, and after their observing runs, and assists with their data analysis. Performs general and specific support of the telescope operations and/or instruments and their development. Undertakes a program of astronomical research, which may or may not be related to using the James Clerk Maxwell Telescope (JCMT).

CLOSING DATE: February 28, 2017

For more information visit the EAO Jobs homepage.

– 2017/02/02

Announcing the JCMT Large Programs (II)

The East Asian Observatory is pleased to provide an early announcement of the second Call for JCMT Large Programs. This information is being provided ahead of the opening of the Call in order for current and new teams to pursue discussion and planning. Submissions will be accepted from February 15th up until the March 15th deadline. This will coincide with the 17B PI Call.

For more information please visit:
http://www.eaobservatory.org/jcmt/proposals/large-programs-call-ii/

To help cultivate ideas discussions on potential new JCMT Large Programs EAO have provided a wiki for interested JCMT users:
https://www.eao.hawaii.edu/Large-Programs-Call-2017/

Please also be reminded that the 2017 JCMT Users meeting will be held February 13th and 14th in Nanjing, China. For more details on the Users meeting please visit:
http://www.eaobservatory.org/jcmt/science/nanjing2017/

– 2016/11/15

JCMT holds reduction workshop in Shanghai

At the start of October the JCMT held a Data Reduction workshop for JCMT astronomers. The workshop was held at the Shanghai Astronomical Observatory in China. Over 20 astronomers attended with a variety of backgrounds. The material presented at the workshop can be found here. Information on past workshops can be found here. If you are interested in having JCMT staff visit your institution for such an event please contact helpdesk@eaobservatory.org.

Participants at the JCMT reduction workshop, China, October 2016.

Participants at the JCMT reduction workshop, China, October 2016.

– 2016/10/25

Supplementary Call for Proposals in Semester 16B

For the second successive summer, we have experienced unusually poor weather at the start of the B-semester, and we are facing a period of 7 weeks without SCUBA-2 in October and November, as it undergoes important maintenance. The combination of these events has severely impacted our supply of approved band-3/4 heterodyne programs.

We therefore invite new proposals to observe targets with 20h < RA < 04h with HARP and/or RxA, for immediate assessment, approval and execution.

See here for details; where the ‘Semester’ in question is called ’16X’.

You can reach the proposal handling system, Hedwig,  and find complete details of this Call at:

https://proposals.eaobservatory.org/

Any further questions should be directed to our helpdesk:

helpdesk@eaobservatory.org

If this is your first visit to Hedwig, you should go to ‘Log in’ and generate an account. There is a ‘Help’ facility at the upper right corner, and individual Help tags at many other places.

This Call for Proposals closes on the 11th of October 2016. We welcome submissions now.

– 2016/09/27

Users Meeting – Nanjing 2017

JCMT-UsersMeeting-2017-annoucement

Dear JCMT users

You are invited to attend the second EAO JCMT Users Meeting. This 2017 JCMT Users meeting will be held in Nanjing, China. The two day meeting will be held on Monday, 13th and Tuesday 14th of February. An additional 1 half-day data reduction workshop will be held immediately after the meeting on Wednesday 15th of February.

To register for the 2017 Users Meeting please use the online registration form.

Note: If you cannot access the registration form (which is a Google document), then please use this text form and email to jcmt_um_2017 “at” eaobservatory.org.

Note: All participants coming from outside of mainland China will likely require a visa. Therefore to  request a letter of invitation to attend this meeting please email:  jcmt_um_2017 “at” eaobservatory.org This process can be lengthy. You are encouraged to request this invitation letter and begin the visa application process as soon as possible.

For more information visit: www.eaobservatory.org/jcmt/science/nanjing2017/

– 2016/09/13

JCMT workshop, Shanghai, October 16th 2016

The JCMT would like to announce that the Shanghai Astronomical Observatory will hold 1-day workshop on JCMT data reductions and analysis on Oct. 16 at SHAO in Shanghai. JCMT staff, Dr. Harriet Parsons and Dr. Mark Rawlings, will give these tutorials.  The agenda can be found below.

This workshop is scheduled before JINGLE team meeting in Shanghai (Oct. 17-18) and MALATANG team meeting in Nanjing (Oct. 19-21) as a united conference. We aim to open this tutorial to all interested researchers and students, and high priority will be given to members of JINGLE, MALATANG and other JCMT large programs due to space limitation.  If you are interested to attend, please contact Ting Xiao (xiaoting@shao.ac.cn) as soon as possible to help us get a rough head account.

Agenda for the workshop on Oct. 16:

Morning session:

  • introduction to STARLINK
  • introduction to HARP and RxA3m
  • Heterodyne beginner
  • Heterodyne advanced

Afternoon session:

  • introduction to SCUBA-2
  • SCUBA-2 basic
  • SCUBA-2 advanced

In addition if requested we could cover any of the following (time permitting):

  • Hedwig session – Proposal submission to the JCMT
  • JCMTOT – how to submit JCMT project MSBs
  • POL-2 introduction and basic data reduction in an extended session
  • General JCMT project support for existing users

 

If you are interested in any additional topics listed above, please inform us in the email.

– 2016/09/09

Call for Proposals 17A

The East Asian Observatory is happy to invite PI observing proposals for semester 17A at JCMT (for details see here).

Semester 17A runs from 01 February 2017 to 31 July 2017. You can reach the proposal handling system, Hedwig,  and find complete details of this Call at:

https://proposals.eaobservatory.org/

Any further questions should be directed to our helpdesk:

helpdesk@eaobservatory.org

If this is your first visit to Hedwig, you should go to ‘Log in’ and generate an account. There is a ‘Help’ facility at the upper right corner, and individual Help tags at many other places.

The 17A Call for Proposals closes on the 15th of September 2016.

NEW: The East Asian Observatory invites requests for Urgent Observing at any time – and you can now submit these request via a special Call in our Hedwig proposal system. You can find details here.

Constraints and guidance on applicant eligibility, the available instrumentation, the required content of the proposal, and other aspects of the proposal are as described in the Call for Proposals for the current semester – except as itemized below.

Urgent Requests should clearly describe the following:
1. The urgency for the observations, and why a response to the regular, semi-annual Call for Proposals is/was inappropriate.
2. The time span over which observations may be made or the specific times at which they must be made.
3. The timescale for analysis of resulting data and for publication thereof; which ought to be proportionately urgent . . .

The above information should appear in the Scientific Justifications section of the proposal; itemized as above, please. If approved, proposals will be graded with respect to the approved projects in the current semester and executed via JCMT’s Flexible Observing scheme.

– 2016/08/15

Status of SCUBA-2

SCUBA-2 was recently returned to service after a 5-week-long absence due to a partial cryogen blockage. It has been returned to full service, despite requiring alternative operating conditions because of a problem diagnosed with one of the Pulse Tube Coolers. This issue has left the instrument filters at temperatures that are fractionally warmer than normal. SCUBA-2 operation will be maintained until October 5, when it will be removed from the telescope to replace the PTCs and also install new optical filters which we expect to improve the instrument performance. SCUBA-2 return to service is expected on or before November 24.

We apologize for the inconvenience and will keep you updated as to our progress.

– 2016/08/03

Face-to- face workshop for “SAMPLING-TOP- SCOPE”, December 14-16, Beijing -1 st announcement

The Planck satellite has discovered more than ten thousand Galactic cold clumps, the so-called “Planck Galactic Cold Clumps” (PGCCs). The PGCC catalog, covering the whole sky, hence probes wildly different environments, and represents a real goldmine for investigations of the early phases of star formation. After the successful start of the pioneer survey with the PMO 14-m telescope, we are conducting a joint survey (“SAMPLING-TOP- SCOPE”) towards 1000-2000 PGCCs with the SMT 10-m, TRAO 14-m, and JCMT 15-m telescopes. “SAMPLING” (SMT “All-sky” Mapping of PLanck Interstellar Nebulae in the Galaxy) is an ESO public survey inJ=2-1 12CO/13CO emission using the SMT 10-m telescope. “TOP” (TRAO Observations of Planck cold clumps) aims at an unbiased J=1-0 12CO/13CO survey of 2000 Planck Galactic Cold Clumps with the Taeduk Radio Astronomy Observatory 14-meter telescope. “SCOPE” (SCUBA-2 Continuum Observations of Pre-protostellar Evolution) is a legacy survey using SCUBA-2 at the James Clerk Maxwell Telescope (JCMT) of the East Asia Observatory (EAO) to survey 1000 Planck galactic cold clumps at 850 micron. We are also actively developing follow-up observations towards the SCUBA-2 cores detected in “SCOPE” with other ground-based telescopes (e.g. KVN 21-m, NRO 45-m, Effelsberg 100-m, Arecibo 300-m, SMA, and ALMA). Through these observations, we will study how dense cores form and how star formation varies as a function of environment, the universality of filaments in the cold ISM and their roles in generating dense cores, the existence of a density threshold for dense core formation, how dust properties change in different environments, and how dust properties affect the chemical evolution of dense cores.

To promote collaborations among team members on using the survey data for science, we will hold a face-to-face workshop on Dec. 14-16 at Peking University, Beijing, China. To indicate your interest in attending the workshop, please sign your name on the following doodle page:

http://doodle.com/poll/443gppgf4mc4y5rc

More details of the workshop can be found on our wiki page:

https://topscope.asiaa.sinica.edu.tw/tiki/tiki-index.php

Program (preliminary)

Dec 14: registration and reception
Dec 15: talks and discussions
Dec 16: talks and discussions

SOC: Tie Liu; Mark Thompson; Sheng-Yuan Liu; Gary Fuller; Ken Tatematsu; Yuefang Wu; Di Li; James di Francesco; Kee-Tae Kim; Ke Wang; Isabelle Ristorcelli; Mika Juvela

LOC: Jie Yao; Chao Zhang; Shuxian Li; Huawei Zhang; Yuefang Wu (ywu@pku.edu.cn); Tie Liu (liutiepku@gmail.com)

– 2016/07/21

JINGLE meeting Oct. 16-18 in Shanghai – 1st announcement

The JINGLE Team meeting and JCMT Data Reduction & Analysis Workshop will be held on Oct. 16-18 in Shanghai at the Shanghai Astronomical Observatory, China.

JINGLE (The JCMT dust and gas In Nearby Galaxies Legacy Exploration) began in Dec. 2015, and the overall program completion is about 1/4.  Team members are encouraged to join the team meeting on Oct. 17-18 to discuss the survey status and plan, data reduction and evaluation, data analysis, and most importantly the scientific projects based on survey data.  The JINGLE meeting and MALATANG meeting are scheduled in one week for a united conference focusing on two main themes: 1) cold gas and dust in large sample of galaxies and 2) dense gas and gas/dust in the nearest 20+ brightest infrared galaxies.

Before the JINGLE team meeting, we will have 1-day tutorial on JCMT data reductions and analysis provided by JCMT staff.  We will open this tutorial to all interested researchers and students.  But due to space limitation, high priority will be given to JINGLE members and members of JCMT large programs .

If you need an invitation letter for VISA application, please contact the LOC as soon as possible!

SOC:  Amelie Saintonge, Chris Wilson, Ting Xiao, Cheng Li, Yu Gao, Lihwai Lin, Ho Seong Hwang, Tomoka Tosaki

LOC:  Ting Xiao (xiaoting@shao.ac.cn), Yang Gao (gaoyang@shao.ac.cn), Yang Yang (yyang@shao.ac.cn)

Please visit the wiki page and add your name there if you plan to attend the meeting:

https://www.eao.hawaii.edu/JINGLE/Fall2016MeetingPage

– 2016/07/14

MALATANG meeting Oct. 19-21 in Nanjing – 1st announcement

The coordinators for the MALATANG Large Program invite you to attend thier first face-to-face  team meeting on Oct. 19-21 in Nanjing.   Team members are highly encouraged to join the meeting, to discuss survey status, data reduction and evaluation, data analysis, future observations, and all the potential scientific projects.

To indicate your interest in attending the meeting please add your name to the following doodle page:

http://doodle.com/poll/duudphqvdiidq668

If you need an invitation letter for VISA application, please contact the LOC as soon as possible!

Note that prior to the MALATANG meeting, the JINGLE meeting will be held on Oct 16-18 in Shanghai, including a JCMT tutorial on Oct 16. Further details regarding the JINGLE meeting will follow soon.

MALATANG and JINGLE share some common/related subjects and overlap members, so you may consider attending both!

MALATANG logo

Agenda (preliminary)

Oct 19: reception

Oct 20: MALATANG discussion 1

Oct 21: MALATANG discussion 2

SOC

Yu Gao

Thomas Greve

Zhiyu Zhang

LOC

Hongjun Ma (hjma at pmo.ac.cn)

Xuejian Jiang (xjjiang at pmo.ac.cn)

Qinghua Tan (qhtan at pmo.ac.cn)

Traffic info

It only takes less than 2 hours from Shanghai to Nanjing by high speed trains

train schedule: http://english.ctrip.com/trains/schedule/shanghai/

– 2016/07/07

POL-2 information for 16B proposals

For potential PIs who wish to submit a POL-2 proposal for semester 16B (deadline 2016-03-16 01:00 UT), we have now prepared a brief guide page with details on the estimated sensitivity and observing mode of the instrument, at:

http://www.eaobservatory.org/jcmt/instrumentation/continuum/scuba-2/pol-2/

The Integration Time Calculator in Hedwig has also been updated. When performing a SCUBA-2 calculation, you can now select the POL-2 scan pattern POL-2 Daisy, to get a POL-2 time or noise estimate.

Please do remember, the 16B call for proposal closes in only 15 days!

JCMT announces new Deputy Director – Jessica Dempsey

We welcoming Jessica Dempsey to the role of Deputy Director of the JCMT. In addition to this we are proud to announce she has been also just been recognized with a Women Who Mean Business award for “Women to Watch”.

Jess-wwmb1

Jessica Dempsey receiving the award for “Women to Watch” March 2016.

Jess-WWMB

Jessica Dempsey winner of “Women to Watch” 2016.

– 2016/03/01

Call for Proposals 16B

The East Asian Observatory is happy to invite PI observing proposals for semester 16B at JCMT (for details see here).

Semester 16B runs from 01 August 2016 to 31 January 2017. You can reach the proposal handling system, Hedwig,  and find complete details of this Call at:

https://proposals.eaobservatory.org/

New in 16A: the likely availability of POL-2. If you are interested
in doing polarimetry with SCUBA-2 please contact us at

helpdesk@eaobservatory.org

If this is your first visit to Hedwig, you should go to ‘Log in’ and generate an account. There is a ‘Help’ facility at the upper right corner, and individual Help tags at many other places.

The 16B Call for Proposals closes on the 15th of March 2016.

JCMT Legacy Release 1 (SCUBA-2 850µm)

The JCMT is pleased to announce that its JCMT Legacy Release 1 (SCUBA-2 850µm) data set is now publicly available. This project makes available to the community uniformly reduced observations of most public SCUBA-2 850µm observations taken before 2013-08-01, as well as coadds and emission catalogs.  Please see our web page on the JCMT-LR1 for more details.

JCMT-LR1 (September 2015: SCUBA-2 850µm)

  • Public 850µm SCUBA-2 observations taken between 2011-02-01 and 2013-08-01.
  • Gridded onto HEALPix tiles using the HPX projection.
  • All reduced using the same SMURF makemap dimmconfig ‘jsa_generic’ (included in the Starlink 2015A release)
  • Coadds of all the reduced non-pointing observations which passed Quality Assurance coadded onto a single tile.
  • Catalogues of detected (>5σ) regions of contiguous emission (extents) towards each tile.
  • Catalogues of local peaks within the extents of each tile.
  • Over 2000 hours of observing time included.
  • Search CADC with proposal ID=’JCMT-LR1′ to view the coadds and catalogues.

 

Call for Proposals 16A

The East Asian Observatory is happy to invite PI observing proposals for semester 16A at JCMT (for details see here).

Semester 16A runs from 01 February 2016 to 31 July 2016. We are launching this Call through a new proposal handling system: Hedwig. You can reach Hedwig and find complete details of this Call at:

https://proposals.eaobservatory.org/

At your first visit, you should go to ‘Log in’ and generate an account. We hope you will find Hedwig easy to use: there is a ‘Help’ facility at the upper right corner, and individual Help tags at many places on the proposal pages.

The 16A Call for Proposals closes on the 22nd of September, 2015.

In addition, it should be noted that we will embark on survey observing in the 16A semester – and as such, PI time is more limited than the current semester, however we still strongly encourage PI submissions as at least 800 hours of time will be available to EAO and partner region investigators. Some alterations have also been made to the PI eligibility for Canada – please see the Call for details.

New Horizons for the JCMT with the East Asian Observatory: Latest Science from the JCMT

2015 IAU Splinter Session

August 6th 6pm-8pm  

Room 312 Hawaii Convention Center


The East Asian Observatory has forged a new path for the JCMT following the successful transfer of operation to EAO in March 2015. Operations immediately resumed with an EAO Pilot Science semester initiated in late March, taking successful science with JCMT’s signature instruments, and recommencing commissioning of the additional instrument elements (Pol-2 and FTS-2) for SCUBA-2. In this special session, we will present the latest results from the JCMT Legacy Surveys, completed in early 2015. We will also show some of the recent results from Pilot Science, and discuss the plans EAO and its partners have for continuing to keep the JCMT at the cutting edge of sub-millimeter science.

Organizer: Jessica Dempsey


 6:00pm: Welcome and introduction (Paul Ho)

JCMT Legacy Science: New Insights
6:10pm: The Cosmology Legacy Survey (Jim Geach)
6:25pm: Current and future directions in star formation research with the JCMT (Derek Ward-Thompson)
6:40pm: The Nearby Galaxies Survey (Christine Wilson)
6:55pm: The JCMT Legacy Archive (Sarah Graves)

EAO Pilot Science
7:05pm: Highlights from Taiwan (Sheng-Yuan Liu)
7:15pm: Highlights from China (Yu Gao)
7:25pm: Highlights from Korea (Woojin Kwon)

Instrument Directions for JCMT:
7:35pm – 8:00pm: Panel discussion and question and answer session on future instrument upgrades and new instrument concepts.


Upcoming IAU

IAUlogo

The largest gathering of astronomers from around the world will be happening this August in Hawaii!  The International Astronomical Union will assemble at the Honolulu Convention Center for six symposia and 22 focus meetings that will cover everything from the “Search for Water and Life’s Building Blocks in the Universe” to “Advances in Stellar Physics from Asteroseismology” and everything in between.  Of course we will be there!  For more information visit the event website at http://astronomy2015.org/

Save the Date: AstroDay

astrodayAstroDay is one of the most engaging outreach events on the Big Island and fun for the whole family!  Come on down to the Prince Kuhio Plaza in Hilo, Hawaii on Saturday, May 2nd from 10am – 4pm for a celebration of Astronomy and Hawaiian Culture.  The mall will be packed with exciting exhibits and interactive displays, live music and performances on a main stage, plus tons of free handouts and chances to win cool prizes.  We hope to see you there!

Successful “Journey”

IMG_3179

Telescope System Specialist, Callie Matulonis, visiting Mrs. Thatcher’s 5th grade class at Connections Elementary School. Photo Credit: Pam Thatcher

The Journey Through the Universe program is always an enormous success in Hawaii, and this year was no different.  Over the past 11 years, scientists, astronomers, and engineers have engaged over 50,000 students while visiting over 3,000 classrooms on the Big Island during the annual “Journey” week.  This March, several EAO staff presented exciting information and activities to over 100 students in grades 5-8 in the Hilo-Waikea Complex.  For more information on Journey Through the Universe visit http://www.gemini.edu/journey.

First Day of Operations

It is with great enthusiasm that the East Asian Observatory (EAO) announces its first day of operations of the James Clerk Maxwell Telescope (JCMT). The JCMT is the largest astronomical telescope in the world designed to operate in the sub-millimetre wavelength region of the spectrum. EAO is now in charge of JCMT operations in partnership with the UK and Canadian research communities.

Paul Ho the Director General of the East Asian Observatory said “It is a great opportunity for the East Asian Observatory to take over the operation of JCMT which is an excellent facility with extremely powerful instrumentation. Many of our astronomers in East Asia have long been involved in pursuing the most important problems in astronomy by utilizing the amazing telescopes on top of Mauna Kea. It is a great privilege for us to be able to work at the best site for ground based astronomy in the Northern Hemisphere. For all of us at the JCMT, we look forward to an exciting future in continuing to deliver frontier science to our communities.”

EAO would like to thank the people of Hawaii for allowing our astronomers to work on top of one of the most beautiful places on earth.

JCMT_Transfer_small_038

The JCMT handover signing: Back row left to right: Jun Yan, Director, National Astronomical Observatories of China, Dr Guenther Hasinger, Director, Institute for Astronomy, University of Hawaii, Professor Gary Davis, former Director of the Joint Astronomy Centre. Front row left to right: Dr Paul Ho, Director General, East Asian Observatory, Professor Matt Platz , Assistant Chancellor for Academic Affairs, University of Hawaii, Professor John Womersley, Chief Executive STFC. (Credit: Hollyn Johnson/Professor Gary Davis/STFC)

As a memento of this transfer Will Montgomerie, an operator at the JCMT, has released this beautiful night sky time-lapse montage featuring the Telescope:

www.vimeo.com/williammontgomerie/jcmtstarlapse

The Science and Technology Facilities Council of the UK have also issued their own statement about this occasion. The statement can be found here.

Upcoming “Journey”

Journey Through the Universe

Journey Through the Universe is February 27th – March 6th! A nationally recognized week long event in which astronomers visit local classrooms around the island while sharing their passion for physics and astronomy.  Several EAO staff members will be representing the JCMT and hoping to inspire a future generation of scientists!  Visit the Journey Through the Universe website for a complete listing of upcoming local events associated with Journey.